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Now Ubuntu won't start. It shows the loading screen and then nothing else but a black screen and the cursor. When I move the cursor it's very laggy like 5 fps.

I tried to show the console with Ctrl+Alt+F1-6 and do-release-upgrade but console doesn't appear. I have important data on that machine, so I need to access it. Any advice how to safe my installation?

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closed as too localized by qbi, Eric Carvalho, Mik, Seth, Uri Herrera Mar 2 '13 at 6:15

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You can always boot to live and copy your data to a safe location. :) –  harisibrahimkv May 2 '12 at 15:47
    
can i try to upgrade with a live ubuntu –  Martin May 2 '12 at 15:57
    
I don't think so. You can do a fresh install though. I think that would be fine if you back up your data first by getting into live. –  harisibrahimkv May 2 '12 at 16:01
    
It is hard to offer advice when we do not know anything about your computer or installation. Laptop? Desktop? How old/new? Just one disk drive or two or more? How much free space for backups? How many partitions on the drive(s)? Other OS installed or just this one install of 11.10 you were upgrading to 12.04? –  irrational John May 2 '12 at 16:30
    
New Laptop(i7 8g ram), 2 partitions - windows(300gb) and ubuntu(8gb). 10x. –  Martin May 3 '12 at 7:02

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