sudo apt-get install gnome-session

[daviddixit]

I used sudo apt-get autoremove
it is now deleting things.
It ends with Idconfig deferred processing now taking place,
it is expecting a command ...

[sudodus]

superutilisateur

alias superuser alias root. In Ubuntu we use sudo to become superuser while performing the command following it. This is to protect from mistakes, that might destroy the system or remove a lot of files. sudo can be interpreted as 'superuser do'

[daviddixit]

I did that and it deleted all sorts of things.
It now says: Idconfig deferred processing now taking place.
It has now stopped and is waiting for a command.

[sudodus]

I used sudo apt-get autoremove
it is now deleting things.
It ends with Idconfig deferred processing now taking place,
it is expecting a command ...

That takes some time, usually not expecting a command, just returning to prompt

user@system /path $

[daviddixit]

it ends with the master@mastermind:
I should just wait then ?

btw, thank you for your patience...

[sudodus]

Try again

# fix Broken packages -f 
sudo apt-get -f install
dpkg --configure -a

and after that finally

sudo apt-get install gnome-session

might work

[daviddixit]

Done, It simply says that it has the most recent available version.

[sudodus]

it ends with the master@mastermind:
I should just wait then ?

btw, thank you for your patience...

Maybe I should explain, that when the terminal window shows that line with master@mastermind (or similar for other users), the previous command has finished, and the command line shell bash is ready for new commands.

[daviddixit]

What final (?) command should I give ?

[sudodus]

Done, It simply says that it has the most recent available version.

Good, in that case you have succeeded. Maybe you succeeded long ago to install gnome-session, but you did not realize that.

Now what do you want to do with gnome-session? If you are lucky, you can log out and select it at the log in screen and log in again. If you are running Ubuntu, there is a round icon near the log in text. Click on it!