I was upgrading 9.10 to 10.04 on my Dell Ubuntu XPS 410s. Am having a
similar issue. It appears that the upgrade was either interrupted or
hung somewhere in between. Screen was black and not responding to
anything after I came back from work. A hard reboot got me to the
following:

"mount: mounting none on /dev failed: No such device"
"chroot: cannot execute /etc/apparmor/initramfs: No such file or directory"

Then, after a couple of minutes:

a bunch of udevd[2815]: SYSFS{} messages saying: "will be removed in a
future udev version, please use ATTR{} to match the event device, or
ATTRS{}= to match a parent device, in
/etc/udev/rules.d/65-libmtp.rules:87"

Then, this intimidating message: "udevd[2815]: specified user 'usbmux'
unknown"

And this final line: "os_part has been mounted 27 times without being
checked, check forced."

Whatever that process is, it hangs interminably.

Please help with simple, step-by-step solution.

Thanks so much!

-- 
Scheduled fsck during boot unresponsive and inactive for a very long time at 
90%, making the system appear to hang
https://bugs.launchpad.net/bugs/487744
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