### Check debian version
lsb_release -a
Debian operating system is pre-installed. To update and upgrade it
# update the list of available packages and their versions, it does not install or upgrade any packages.
$ apt-get update
# install newer versions of the installed packages
$ apt-get upgrade
or combine both
apt-get update && apt-get upgrade
$ nano /etc/locale.gen
Uncomment tr_TR.UTF-8 UTF-8, and run below to activate locale
$ locale-gen
$ dpkg-reconfigure tzdata
See the list of all the currently installed and deinstalled
dpkg --get-selections
See how many packages are in the ‘deinstalled’ state with this command:
dpkg --get-selections | grep deinstall | wc -l
To purge all of these packages at once:
dpkg --get-selections | grep deinstall | sed 's/deinstall/\lpurge/' | dpkg --set-selections; dpkg -Pa
To disable the login manager from automatically running at boot up, run the following command as root
update-rc.d -f gdm remove
To start X manually, you would then have to login at the command prompt and enter the command
startx
To reset your login manager so that it runs at boot up, do
update-rc.d -f gdm defaults