I'm a new Linux user and just installed Ubuntu, wanted to try other Desktop Environments however it didn't work. It only loads up with the Lubuntu logo and Login screen, after that It's just Ubuntu. I ran this command:
sudo apt-get install lubuntu-desktop
However I'm not sure how to switch back, I tried the purge command got rid of it now only black screen during loading.
Side Question: Dual Boot with Windows – Change Linux Dist without having to reformat entire Windows?
Best Answer
In case of problems with logging in: it could be that purging deleted a needed file in /home/$USER/ or it changed permissions on a needed file. If the problems occur before login it is more than likely related to the video card driver.
1st thing to do is to go to a TTY (control alt f1). You can use apt-get to re-install ubuntu with:
(or any other desktop) or re-install your video card driver or re-configure your video card.
If that is not possible you can also do this from the grub prompt or from a live session.
As a future method of doing this: do not mess with your OS. Install virtual box or vm ware and install Ubuntu in that. Make a copy of the container and you can mess with desktops all day long. Restore the container and all is back to normal.