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My computer boots to a black screen, what options do I have to fix it?

After installing Ubuntu on my fresh desktop, the Ubuntu loading screen shortly appears and then I get a black screen. After that the screen is split into two.

The image begins at the middle and then continues over the left half of the screen. I have a Radeon 6850HD with dual monitors connection, has it something to do with this?

When booting in failsafe mode, I get a message that Ubuntu failed to load failsafe video drivers. I am able to start a live session though. So I guess it loads the wrong drivers upon booting from hd. I think maybe editing the xorg.conf file could help, but until now I did not succeed.

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marked as duplicate by Marco Ceppi Aug 22 '12 at 14:30

This question was marked as an exact duplicate of an existing question.

Are you able to boot into recovery mode? You need to install the proprietary drivers (use sudo jockey-text) – RolandiXor Apr 5 '12 at 3:25
Sometimes I can boot into the system, sometimes not. So yesterday i installed the property drivers, it worked well but today I cannot boot again, the same problems. What does your command do exactly? – wouter205 Apr 7 '12 at 10:50
it allows you to install the proprietary drivers from the command line. – RolandiXor Apr 8 '12 at 22:29

I cannot comment (I don't know why) so I answer as far as I had similar problem with Ubuntu 12 and my nvidia card. What I did is to install the alternate distro and when I had to reboot I chose the recovery mode, set up network, return to main menu and finally update whatever I could.

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