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.