Just encountered a variant of this in Hardy this morning. I had a single
FAT 16 partition USB flash drive connected to my computer. For some
reason at boot up fsck was seeing it as /dev/sdb; normally my first hard
drive is mounted at /dev/sda , my second hard drive is /dev/sdb , and
since Hardy install the USB flash is /dev/sdc. Fsck wanted to check the
file system on my second hard drive, however, due the mount order issue
it tried to fsck the USB flash drive. That caused this error:

The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

fsck died with exit status 8

I rebooted and the same problem happened. I turned off my computer,
removed the USB drive, and rebooted fsck ran normally and checked my
second hard disk and my computer booted normally. Unlike the OP I could
not simply type exit and have the drives mounted in the correct
locations. If I did that, on log in I got an error about how my home
directory was unable to be found.

ProblemType: Bug
Architecture: i386
Date: Sunday Apr 27 2008
DistroRelease: Ubuntu 8.04
Uname -r: 2.6.24-16-386

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error on booting up mounting an external usb-drive
https://bugs.launchpad.net/bugs/97206
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