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I had Ubuntu up and running very well. I then decided to update to 12.10 and the upgrade process seemed to go through very well too.

When I started the computer again, all I got with a Terminal login: The only message, which appeared on the screen was: Ubuntu quantal (development branch) ubuntu tty1. ubuntu login:

How can I start the system in the graphical mode? What must I do to use the graphical system again?

Please advise as I can't work with the terminal mode.

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Ubuntu +1 questions is off-topic on this site, sorry – Anwar Sep 15 '12 at 5:14
Development releases should not be used to "upgrade" your main computer or boot partition unless you are used to and like fixing a broken system. By all means install it into another partition for testing or to take part in QA, but expect things to break on a more or less regular basis. If this is indeed your main boot partition you should backup all your important data and re-install 12.04 LTS. - Chris – fabricator4 Sep 15 '12 at 5:40

closed as off topic by Anwar, Mitch, jokerdino♦, fossfreedom♦ Sep 15 '12 at 10:04

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1 Answer

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I believe your Display Manager got corrupted. Using root permissions, you could try

sudo apt-get update
sudo apt-get install aptitude
sudo aptitude reinstall lightdm

if that fails, try gdm

sudo aptitude install gdm
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