root@docker:~# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Error saving credentials: error storing credentials - err: exit status 1, out: Failed to execute child process “dbus-launch” (No such file or directory)
To solve above problem, remove golang-docker-credential-helpers package by this command:
apt-get remove --purge golang-docker-credential-helpers
To list all currently installed packages, type “dpkg –get-selections”. You can save this data to a file by running “
dpkg --get-selections > ~/packages.txt“.
And then place this file on another system and install the listed packages by running “
cat packages.txt > sudo dpkg --set-selections && sudo apt-get dselect-upgrade“.
Also, the list of packages can be loaded for installation by running “
dpkg --clear-selections && sudo dpkg --set-selections < packages.txt".
This could be used also for recovery. This trick is helpful when a system must be reinstalled, then all of the same packages can be installed all at once.
Sometimes, the output of "
dpkg --get-selections" may list packages marked to be uninstalled or some other status. If so happens, use the following "
dpkg --get-selections | grep -w install$ > ~/packages.txt". I mean, "
| grep -w install$"
Ubuntu 12.04 does not ship with any screen savers, just a black screen that appears when your system is idle. If you would like to have a screensaver, please follow the steps below:
Uninstall a gnome-screensaver.
sudo apt-get purge gnome-screensaver
sudo apt-get install xscreensaver xscreensaver-gl-extra xscreensaver-data-extra
Create a symbolic link for Ctrl+Alt+L is the default shortcut that locks your computer.
sudo ln -s /usr/bin/xscreensaver-command /usr/bin/gnome-screensaver-command
Finally, add the
xscreensaver -nosplash to the Startup Applications.
Every time I reboot my laptop the brightness goes back to 100% in Gnome. I wish it would keep the last one setting. Here is a quick workaround for that:-) edit the
/etc/rc.local file by typing:
vim /etc/rc.local and add the following line:
echo 5 > /sys/class/backlight/acpi_video0/brightness
It looks like this:
root@ProBook:~# cat /sys/class/backlight/acpi_video0/brightness
root@ProBook:~# echo 5 > /sys/class/backlight/acpi_video0/brightness
root@ProBook:~# vim /etc/rc.local
root@ProBook:~# cat /etc/rc.local
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
# In order to enable or disable this script just change the execution
# By default this script does nothing.
echo 12 > /sys/class/backlight/acpi_video0/brightness
After the reboot the Gnome keeps our settings 🙂
usermod --expiredate 1 username instead of
passwd -l username.
Passwd -l does not disable an account, just makes the password unusable, but the user could still login using an ssh key or other auth meth.
By the way, I know a lot of admins who made this mistake 😉
I just attempted to install the newest Linux Citrix ICA client on my machine, and upon a successful install, an error similar to this one popped up when trying to run the client from Firefox:
Contact your help desk with the following information:
ble, ble ...
the issue of the server's security certificate (SSL error 61).
The solution is to make Firefox’s certificates accessible to Citrix, like so:
sudo ln -s /usr/share/ca-certificates/mozilla/* /opt/Citrix/ICAClient/keystore/cacerts
I didn’t test it on the Debian yet.