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I tried to upgrade Ubuntu to 12.04.1, but in the middle of the upgrade, something got borked, and now Ubuntu won't boot. When I try to run recovery mode, it says "Loading inital ramdisk" I'm dual-booting with Win7, so I made an Ubuntu Live-USB, but when I boot from it, I can't find my other (original) Ubuntu partition. What's going on, and how can I go about fixing this?

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2 Answers

Failed upgrade leads to missing/broken system files. The only way to fix them is to use a Ubuntu12.04.1 liveCD (or liveUSB), boot on it and follow: https://help.ubuntu.com/community/UbuntuReinstallation

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If the Ubuntu Partition is ext4/ext3, use Ext2Fsd to access the Ubuntu partition, and back up files you want. Then use a partition editor and delete the Ubuntu partition. Reboot. If you see GRUB Rescue, boot into a Ubuntu installation media, choose "Try Ubuntu", install Boot Repair, and run it. https://help.ubuntu.com/community/Boot-Repair. Those are the instructions. If you don't see GRUB Repair, then install Ubuntu (latest version), transfer any files you backed up, and you should be on your way.

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