Cannot RDP to Amazon EC2 instance(windows server)

After launching windows 2016, Amazon EC2 instance,

I received ec2-18-221-95-56.us-east-2.compute.amazonaws.com.rdp file to connect to windows instance.

From my ubuntu laptop, Clicking the .rdp file, I receive this below message after providing password:

You requested an H264 GFX mode for server ec2-18-221-95-56.us-east-2.compute.amazonaws.com, but your libfreerdp does not support H264. Please check Color Depth Settings.

Ubuntu bionic laptop:

$ uname -a
Linux machine 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Ran below commands, to resolve this problem(no luck):

sudo apt-add-repository ppa:remmina-ppa-team/remmina-next
sudo apt-get update
sudo apt-get install remmina remmina-plugin-rdp libfreerdp-plugins-standard

How to resolve this issue?

Solution:

I haven’t tried connecting to a Windows machine using a Linux OS using RDP, but I found something related to your issue that could help. It seems that by changing the color depth setting, should be enough to connect. I was reading this blog and it seems that this could be a solution.

Procedure for the workaround:

  • Click the little + in the upper-left corner of the window. It is a bit
    hard to see; the color scheme seems to be dark grey on grey.
  • From here, choose a different color depth setting
  • Click Save as Default, or enter other settings and click Save.

This was found by an user called Ian in that respective blog.

Update

In order to connect to your Windows VM, you need to right click on the instance, a choose connect. There you will find your public DNS, which you can use to connect to that machine. You will see the following dialog.

enter image description here

If you want your public IP, on your instance administration window, select the instance, and under description in the below menu, you will see it.

enter image description here

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kernel:NMI watchdog: BUG: soft lockup – CPU#0 stuck for 21s!

If you think that overcommitment is the reason, you can use the following:

CODE:

echo [time] >  /proc/sys/kernel/watchdog_thresh

where time cannot be more than 60.

./path of file to execute not executing

I am trying to execute matlab from desktop path of file is

      /usr/local/MATLAB/R2017b/bin/matlab

executing ./usr/local/MATLAB/R2017b/bin/matlab

also tried .//usr/local/MATLAB/R2017b/bin/matlab

and ./ /usr/local/MATLAB/R2017b/bin/matlab
how it works?

Solution:

Just run /usr/local/MATLAB/R2017b/bin/matlab to access the binary via the full path otherwise you will run try to run it via the relative path: <CURRENT DIR>/usr/local/MATLAB/R2017b/bin/matlab if you put a . before.

You can also change the add /usr/local/MATLAB/R2017b/bin/ to your path variable in order to be able to execute the command matlab without having to specify its whole path each time.

Also change your ~/.bashrc file and add PATH=$PATH:/usr/local/MATLAB/R2017b/bin to be able to keep those change after a reboot and just run matlab

startx /bin/bash in fullscreen without desktop

Ok so I know it’s a weird case but hang in here with me.

So the thing is I’ve got an very old laptop running ubuntu 14.04 server without any desktop aka shell only. BUT the laptop also has a touch screen so we want to be able to use the “mouse”/touchscreen/touchpad to select text inside the terminal and/or click/copy/paste/cut/etc. It’s part of art project with some students and also one of the tasks is to run as less as possible. So running a desktop in the background is not really an option. My question is:

Is there a way to start the Ubuntu terminal as UI application in fullscreen without the actual desktop in the background but giving the functionality of an mouse cursor.

(If someone knows a even better solution for adding a mouse without starting the desktop its appreciated)

Solution:

Try this: create a ~/.xinitrc with content : exec gnome-terminal, then run startx

Or another solution is to stay in and install gpm for mouse control

Does fork() work differently on Ubuntu in Comparison to other Linux Distribution?

Ok, so here is the initial Code I was working with on an Ubuntu 17.10.

#include <unistd.h>
#include <stdio.h>
void main()
{
   printf("Demonstrating fork():\n");
   fork();
   printf("After fork():\nProcess Id is %d\n", getpid());
}

So at this stage I found out the output to be : Initial Output

So yeah I executed twice to confirm it. But later I noticed that in Online GCC Compilers and on RedHat in my College Campus, The output is pretty different:

other gcc output

Now as per my knowledge, the fork() creates another instance of the process it is called from. But in Ubuntu it seems it copies from the point where it is introduced in the code, and rather the whole Process. To detect it, I slightly chaged the code to :

#include <unistd.h>
#include <stdio.h>
void main()
{
    fork();
    printf("Demonstrating fork():\n");
    printf("After fork():\nProcess Id is %d\n", getpid());
}

And to my surprise I was right on my observation with the output :

After Change Output

So can anyone confirm this, and explain me why is this happening, or just a bug on my system ?

Solution:

But later I noticed that in Online GCC Compilers and on RedHat in my College Campus, The output is pretty different.

It has to do with the user-space buffer printf() uses.

If the program is executed at the terminal and the output is not redirected to a file, then the buffer is flushed by printf()ing \n.

The online version does not flush the buffer by printf()ing a \n because it is using another flushing policy (e.g.: the output is probably being redirected to a file).

Send characters to console application

I have simple console application that runs in terminal window reads and prints character:

int main(int argc, char **argv, char **envp)
{
    while (true)
    {
        char c =getchar();
        printf("%c \n",c);

    }

}

Now I would like to make test application that could emulate character press in first application terminal.

Which way I should go? What API functions I should use for this purpose?

Solution:

No need for special APIs or whatever. Since your sample application is only reading from standard input, you can just send stuff to there.

Before running the program in a terminal, check its connected terminal using tty command. Then send data to that tty that tty reports.

Alternatively, grab the PID of your running application and send data to /proc/$PID/fd/0 so you don’t need to check for tty.

Install devtools package in ubuntu VM

I try to install devtools package in an Ubuntu 16.04 VM
in which I am wrong.

Other packages I tried the installed successsfully

However I can’t install it and the process in the console is this:

> install.packages("devtools")
Installing package into ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2’
(as ‘lib’ is unspecified)
also installing the dependencies ‘curl’, ‘openssl’, ‘httr’, ‘git2r’

--2018-01-26 22:14:08--  https://cran.rstudio.com/src/contrib/curl_3.1.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 366086 (358K) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/downloaded_packages/curl_3.1.tar.gz’

     0K .......... .......... .......... .......... .......... 13% 1017K 0s
    50K .......... .......... .......... .......... .......... 27% 1,62M 0s
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   300K .......... .......... .......... .......... .......... 97% 2,84M 0s
   350K .......                                               100% 19,6M=0,2s

2018-01-26 22:14:09 (2,18 MB/s) - ‘/tmp/RtmpIF4wAz/downloaded_packages/curl_3.1.tar.gz’ saved [366086/366086]

--2018-01-26 22:14:09--  https://cran.rstudio.com/src/contrib/openssl_0.9.9.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1112927 (1,1M) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/downloaded_packages/openssl_0.9.9.tar.gz’

     0K .......... .......... .......... .......... ..........  4% 1,02M 1s
    50K .......... .......... .......... .......... ..........  9%  194K 3s
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  1050K .......... .......... .......... ......               100% 7,47M=2,8s

2018-01-26 22:14:13 (394 KB/s) - ‘/tmp/RtmpIF4wAz/downloaded_packages/openssl_0.9.9.tar.gz’ saved [1112927/1112927]

--2018-01-26 22:14:13--  https://cran.rstudio.com/src/contrib/httr_1.3.1.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 147593 (144K) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/downloaded_packages/httr_1.3.1.tar.gz’

     0K .......... .......... .......... .......... .......... 34%  934K 0s
    50K .......... .......... .......... .......... .......... 69%  100K 0s
   100K .......... .......... .......... .......... ....      100%  342K=0,7s

2018-01-26 22:14:15 (212 KB/s) - ‘/tmp/RtmpIF4wAz/downloaded_packages/httr_1.3.1.tar.gz’ saved [147593/147593]

--2018-01-26 22:14:15--  https://cran.rstudio.com/src/contrib/git2r_0.21.0.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1155512 (1,1M) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/downloaded_packages/git2r_0.21.0.tar.gz’

     0K .......... .......... .......... .......... ..........  4% 1,06M 1s
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  1100K .......... .......... ........                        100% 83,9M=0,6s

2018-01-26 22:14:16 (1,93 MB/s) - ‘/tmp/RtmpIF4wAz/downloaded_packages/git2r_0.21.0.tar.gz’ saved [1155512/1155512]

--2018-01-26 22:14:16--  https://cran.rstudio.com/src/contrib/devtools_1.13.4.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 486348 (475K) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/downloaded_packages/devtools_1.13.4.tar.gz’

     0K .......... .......... .......... .......... .......... 10% 1,10M 0s
    50K .......... .......... .......... .......... .......... 21% 1,40M 0s
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   450K .......... .......... ....                            100% 8,73M=0,3s

2018-01-26 22:14:17 (1,63 MB/s) - ‘/tmp/RtmpIF4wAz/downloaded_packages/devtools_1.13.4.tar.gz’ saved [486348/486348]

* installing *source* package ‘curl’ ...
** package ‘curl’ successfully unpacked and MD5 sums checked
Package libcurl was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcurl.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcurl' found
Package libcurl was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcurl.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcurl' found
Using PKG_CFLAGS=
Using PKG_LIBS=-lcurl
------------------------- ANTICONF ERROR ---------------------------
Configuration failed because libcurl was not found. Try installing:
 * deb: libcurl4-openssl-dev (Debian, Ubuntu, etc)
 * rpm: libcurl-devel (Fedora, CentOS, RHEL)
 * csw: libcurl_dev (Solaris)
If libcurl is already installed, check that 'pkg-config' is in your
PATH and PKG_CONFIG_PATH contains a libcurl.pc file. If pkg-config
is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
--------------------------------------------------------------------
ERROR: configuration failed for package ‘curl’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/curl’
Warning in install.packages :
  installation of package ‘curl’ had non-zero exit status
* installing *source* package ‘openssl’ ...
** package ‘openssl’ successfully unpacked and MD5 sums checked
Using PKG_CFLAGS=
------------------------- ANTICONF ERROR ---------------------------
Configuration failed because openssl was not found. Try installing:
 * deb: libssl-dev (Debian, Ubuntu, etc)
 * rpm: openssl-devel (Fedora, CentOS, RHEL)
 * csw: libssl_dev (Solaris)
 * brew: openssl@1.1 (Mac OSX)
If openssl is already installed, check that 'pkg-config' is in your
PATH and PKG_CONFIG_PATH contains a openssl.pc file. If pkg-config
is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
--------------------------------------------------------------------
ERROR: configuration failed for package ‘openssl’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/openssl’
Warning in install.packages :
  installation of package ‘openssl’ had non-zero exit status
* installing *source* package ‘git2r’ ...
** package ‘git2r’ successfully unpacked and MD5 sums checked
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking how to run the C preprocessor... gcc -std=gnu99 -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking size of void*... 8
checking for library containing inflate... -lz
checking for library containing EVP_EncryptInit... no
checking for openssl... no
configure: error: in `/tmp/RtmpQ9e11v/R.INSTALL82977388520/git2r':
configure: error: 
  ---------------------------------------------
   The OpenSSL library that is required to
   build git2r was not found.

   Please install:
     libssl-dev    (package on e.g. Debian and Ubuntu)
     openssl-devel (package on e.g. Fedora, CentOS and RHEL)
     openssl       (Homebrew package on OS X)
   and try again.

   If the OpenSSL library is installed on
   your system but the git2r configuration
   is unable to find it, you can specify
   the include and lib path to OpenSSL with:
   R CMD INSTALL --configure-args='--with-libssl-include=INCLUDE_PATH --with-libssl-lib=LIB_PATH' git2r
  ---------------------------------------------
See `config.log' for more details
ERROR: configuration failed for package ‘git2r’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/git2r’
Warning in install.packages :
  installation of package ‘git2r’ had non-zero exit status
ERROR: dependencies ‘curl’, ‘openssl’ are not available for package ‘httr’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/httr’
Warning in install.packages :
  installation of package ‘httr’ had non-zero exit status
ERROR: dependencies ‘httr’, ‘git2r’ are not available for package ‘devtools’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/devtools’
Warning in install.packages :
  installation of package ‘devtools’ had non-zero exit status

The downloaded source packages are in
    ‘/tmp/RtmpIF4wAz/downloaded_packages’

Any idea how could I install it? The problem is the same if I use instead of Rstudio I use the terminal for R

Also installing car package from github, as I can’t find it in the list of Tools->Install Packages has problem:

> library(devtools)
> install_github("cran/car")
Downloading GitHub repo cran/car@master
from URL https://api.github.com/repos/cran/car/zipball/master
Installing car
--2018-01-26 22:39:07--  https://cran.rstudio.com/src/contrib/pbkrtest_0.4-7.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 156406 (153K) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/pbkrtest_0.4-7.tar.gz’

     0K .......... .......... .......... .......... .......... 32% 1,16M 0s
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   150K ..                                                    100% 8,52M=0,09s

2018-01-26 22:39:07 (1,68 MB/s) - ‘/tmp/RtmpIF4wAz/pbkrtest_0.4-7.tar.gz’ saved [156406/156406]

Installing pbkrtest
--2018-01-26 22:39:11--  https://cran.rstudio.com/src/contrib/lme4_1.1-15.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3610706 (3,4M) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/lme4_1.1-15.tar.gz’

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  1800K .......... .......... .......... .......... .......... 52% 1,32M 0s
  1850K .......... .......... .......... .......... .......... 53%  104M 0s
  1900K .......... .......... .......... .......... .......... 55% 14,4M 0s
  1950K .......... .......... .......... .......... .......... 56% 23,1M 0s
  2000K .......... .......... .......... .......... .......... 58% 3,18M 0s
  2050K .......... .......... .......... .......... .......... 59% 2,28M 0s
  2100K .......... .......... .......... .......... .......... 60%  103M 0s
  2150K .......... .......... .......... .......... .......... 62% 2,08M 0s
  2200K .......... .......... .......... .......... .......... 63% 13,6M 0s
  2250K .......... .......... .......... .......... .......... 65% 3,23M 0s
  2300K .......... .......... .......... .......... .......... 66% 4,50M 0s
  2350K .......... .......... .......... .......... .......... 68% 13,9M 0s
  2400K .......... .......... .......... .......... .......... 69% 98,1M 0s
  2450K .......... .......... .......... .......... .......... 70% 42,6M 0s
  2500K .......... .......... .......... .......... .......... 72% 4,12M 0s
  2550K .......... .......... .......... .......... .......... 73% 17,2M 0s
  2600K .......... .......... .......... .......... .......... 75% 73,7M 0s
  2650K .......... .......... .......... .......... .......... 76% 94,0M 0s
  2700K .......... .......... .......... .......... .......... 77%  102M 0s
  2750K .......... .......... .......... .......... .......... 79% 80,8M 0s
  2800K .......... .......... .......... .......... .......... 80%  101M 0s
  2850K .......... .......... .......... .......... .......... 82% 3,39M 0s
  2900K .......... .......... .......... .......... .......... 83% 89,8M 0s
  2950K .......... .......... .......... .......... .......... 85% 88,7M 0s
  3000K .......... .......... .......... .......... .......... 86% 82,8M 0s
  3050K .......... .......... .......... .......... .......... 87% 7,12M 0s
  3100K .......... .......... .......... .......... .......... 89% 80,9M 0s
  3150K .......... .......... .......... .......... .......... 90% 79,9M 0s
  3200K .......... .......... .......... .......... .......... 92% 7,38M 0s
  3250K .......... .......... .......... .......... .......... 93%  100M 0s
  3300K .......... .......... .......... .......... .......... 95% 88,2M 0s
  3350K .......... .......... .......... .......... .......... 96% 9,04M 0s
  3400K .......... .......... .......... .......... .......... 97% 11,9M 0s
  3450K .......... .......... .......... .......... .......... 99% 99,2M 0s
  3500K .......... .......... ......                          100% 97,2M=0,6s

2018-01-26 22:39:12 (6,14 MB/s) - ‘/tmp/RtmpIF4wAz/lme4_1.1-15.tar.gz’ saved [3610706/3610706]

Installing lme4
--2018-01-26 22:39:20--  https://cran.rstudio.com/src/contrib/nloptr_1.0.4.tar.gz
Resolving cran.rstudio.com (cran.rstudio.com)... 54.230.27.181
Connecting to cran.rstudio.com (cran.rstudio.com)|54.230.27.181|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 353957 (346K) [application/x-gzip]
Saving to: ‘/tmp/RtmpIF4wAz/nloptr_1.0.4.tar.gz’

     0K .......... .......... .......... .......... .......... 14% 1,11M 0s
    50K .......... .......... .......... .......... .......... 28%  106K 1s
   100K .......... .......... .......... .......... .......... 43%  644K 1s
   150K .......... .......... .......... .......... .......... 57%  677K 0s
   200K .......... .......... .......... .......... .......... 72% 5,64M 0s
   250K .......... .......... .......... .......... .......... 86%  628K 0s
   300K .......... .......... .......... .......... .....     100% 2,39M=0,8s

2018-01-26 22:39:22 (448 KB/s) - ‘/tmp/RtmpIF4wAz/nloptr_1.0.4.tar.gz’ saved [353957/353957]

Installing nloptr
'/usr/lib/R/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL  \
  '/tmp/RtmpIF4wAz/devtools756410ec724/nloptr' --library='/home/stefan/R/x86_64-pc-linux-gnu-library/3.2' --install-tests 

ERROR: failed to lock directory ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2’ for modifying
Try removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/00LOCK-nloptr’
Installation failed: Command failed (3)
'/usr/lib/R/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL '/tmp/RtmpIF4wAz/devtools7561eb5da54/lme4'  \
  --library='/home/stefan/R/x86_64-pc-linux-gnu-library/3.2' --install-tests 

ERROR: dependency ‘nloptr’ is not available for package ‘lme4’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/lme4’
Installation failed: Command failed (1)
'/usr/lib/R/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL  \
  '/tmp/RtmpIF4wAz/devtools75623bf595c/pbkrtest' --library='/home/stefan/R/x86_64-pc-linux-gnu-library/3.2' --install-tests 

ERROR: dependency ‘lme4’ is not available for package ‘pbkrtest’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/pbkrtest’
Installation failed: Command failed (1)
'/usr/lib/R/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL  \
  '/tmp/RtmpIF4wAz/devtools75635e8f138/cran-car-4f39fce' --library='/home/stefan/R/x86_64-pc-linux-gnu-library/3.2' --install-tests 

ERROR: dependency ‘pbkrtest’ is not available for package ‘car’
* removing ‘/home/stefan/R/x86_64-pc-linux-gnu-library/3.2/car’
Installation failed: Command failed (1)

Solution:

Certainly, the answer is within the output you pasted. You need to isntall in the OS (as opposed as in R) the following dependencies:

libcurl4-openssl-dev
libssl-dev

To install them, run in your terminal:

sudo apt-get update
sudo apt-get install libcurl4-openssl-dev
sudo apt-get install libssl-dev

And then go to R and try reinstalling “devtools”.