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I upgraded to 12.04 today from 11.10 from a bootable thumbdrive. The upgrade took approximately 8 hours. I had to make a new user, and I'm unable to sign into my user that I used in 11.10. I can see my files in the /home/ directory, but there isn't an option to sign into that user on the boot screen. I am also unable to use the normal "Ubuntu" setting, I get a black screen with that. I have to use "Ubuntu 2D". Please help.

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You have a permissions problem.

What you need to do is get to a terminal as explained here, and sign in with your username and password.

Then, you need to run the following:

sudo chmod -R 750 /home/$yourusername

Then, type:

sudo reboot to restart your computer.

Once that's done, you should be able to log in via lightdm.

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When I push Ctrl-Alt-F1, my monitor goes blank with a "Sync out of Range" error. Ctrl-Alt-F7 brings me back to the desktop. Does it have to be one of these weird terminals? Can't I just use the "Terminal" app? – SuperMann May 1 '12 at 12:47
When I tried that command in the normal terminal app, it corrupted all my files and I had to do a clean reinstall. – SuperMann May 3 '12 at 20:15
@Seth Yes, you have to do it in the 'weird terminal'. Otherwise, what you had happen happens. – James May 4 '12 at 1:24
Well, why did my monitor not work when I tried Ctrl-Alt-F1? – SuperMann May 4 '12 at 12:28
@Seth that is worth asking another question, since I don't know. :( – James May 4 '12 at 12:31

A workaround could be : move you old user folders and files to your new user home.

If you want to keep all your setting you must view the hidden folders from nautilus (view > show hidden files) then copy the hidden folders of your choice AKA application you will still use.

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Won't the settings be messed up? – SuperMann Apr 28 '12 at 12:34

Copy/Replace the entire usr/previous user/home with your new /usr/current user/home

Go to user a/c and delete the old one with all files

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