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Today I upgraded to 13.04 (from 12.10) and I already regret doing this because while upgrading my whole system froze (waited for more than 2 hours) and I had to use a hard shutdown.

Since that moment everything went wrong. When I restarted the system I could not login (it would redirect me to the login screen when I logged in). So I had to shutdown again, next time I startup, my bootmanager was corrupted so I had to use boot repair to fix it (here is the log: http://paste.ubuntu.com/5613074/).

Now when I startup it cannot find my operating system so I think it's completely messed up. I have a bootable USB Ubuntu 13.04 on it, hoping that I could repair my installation (or re-install Ubuntu 13.04) but the only choice I have is to overwrite everything.

Is anything wrong with my current configuration and can I fix it? Can I try to exclude the /home/ partition while installing (then I would lose less important information)? I also tried to copy my home folder to an external hdd, but I do not have the permissions to do that and I have no clue how to get permission from my USB.

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13.04 upgrade failed on me also, citing memory errors. I haven't rebooted my machine because I'm afraid of having similar issues here. –  Nicholas Pickering Apr 30 '13 at 4:07
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I saw several people having problems with shutting down their system. I installed a fresh Ubuntu 13.04 in a VM and was able to reproduce the problem (shutting down issue). However, this time it didn't corrupt my bootloader so I could restart. On my machine (where the upgrade failed) however I had to fix my boot manager and then I installed 12.04 over it (because I think that version is still the most stable Ubuntu). –  Dimitri M Apr 30 '13 at 9:59
    
If you do not have permission to access your home folder, you can get it by using gksudo nautilus in alt-f2 or in terminal. That will give you a sudo nautilus which you can access your home folder with. –  DaboRoss Jun 8 '13 at 7:12
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