You might have missed the
Upgrade Guide:
Quote:
Before rebooting into the install kernel
Check diskspace of /usr. Verify that the /usr partition has a size of at least 1.1G. With less space the upgrade may fail and you should consider reinstalling the system instead.
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From your problem description though, it appears your hard drive's root directory is the problem, or at least the initial problem.
Recovery may be possible, but you'll need to know what filesystems you have on that hard drive, how full each is, and what needs to be removed / replaced in order to recover.
If you did not back up /etc and /home before starting your upgrade adventure, you should be able to do so from the RAMDISK kernel shell.