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On my Asus N56VZ notebook I have a UEFI multi boot setup with Win7, Ubuntu 12.04 and Mint 13. This configuration has been working fine, so far. However, a few days ago I decided to upgrade Ubuntu using "sudo apt-get upgrade" command.

Now I only get the command line when I boot into Ubuntu. Both Win7 and Mint are still booting fine.

I've read that I'd end up with a cleaner OS, if I choose to reinstall instead of upgrading. Since I am experiencing problems with Ubuntu already, I see no reason for keeping the current install.

I am concerned about the other partitions, so I'd appreciate some guidance on how to safely replace the broken Ubuntu with a clean installation of 13.04.

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This sounds like an X11 issue. It may be fixable by creating a custom xorg.conf file, as described in this question and answers; however, you may need to edit the xorg.conf file, which is the tricky part. It's also possible that a kernel option passed via the boot loader will fix the problem. In either case, knowing what video chipset you've got will help solve the problem. Also, review /var/log/Xorg.0.log for error messages. –  Rod Smith Nov 4 '13 at 22:57
Simply reinstall Ubuntu on the partition it is right now (in the installer choose manual instead of automatic and change the mount point of the partition where Ubuntu is currently on to '/'). –  FSMaxB Nov 6 '13 at 13:49

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