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Today I ran preupgrade and chose Fedora 14 instead of Fedora 15 to be safe to upgrade from 13 .

After lengthy upgrade, I was able to login but after that whenever I try to open terminal and enter su to login as root, it suddenly hangs or sometimes it hangs by itself or even hangs after reboot. So I have totally corrupted upgrade. Basically kernel crashes.

I read somewhere and found I can go to GRUB menu at reboot and I can choose fedora 13 from there and was glad at least I can go back to old Fedora 13 but I do have to go to GRUB menu to choose Fedora 13 every i have to reboot. Is this OK?

Now in Fedora 13 I have entered command as root: preupgrade and this time I chose Fedora 15. Is this OK? I am hoping the upgrade from 13 to 15 would work.

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If you backup all your important data, you might consider just installing Fedora 15 and restoring from backup. I know that people often do this whenever the upgrade process breaks as badly as yours has. – new123456 Jul 17 '11 at 14:19
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