installer crashed 11.10-alpha3

[sbraz]

i was installing oneric ocelot on my 320gb usb drive and this error popped up.

it stopped while "checking for packages to remove".

lsb_release -rd
Description: Ubuntu oneiric (development branch)
Release: 11.10

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Aug 21 06:20:28 ubuntu plugininstall.py: Traceback (most recent call last):
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1659, in <module>
Aug 21 06:20:28 ubuntu plugininstall.py: install.run()
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Aug 21 06:20:28 ubuntu plugininstall.py: func(self)
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 209, in run
Aug 21 06:20:28 ubuntu plugininstall.py: self.remove_extras()
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1415, in remove_extras
Aug 21 06:20:28 ubuntu plugininstall.py: self.do_remove(regular)
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1017, in do_remove
Aug 21 06:20:28 ubuntu plugininstall.py: if not cache.commit(fetchprogress, installprogress):
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/deprecation.py", line 98, in deprecated_function
Aug 21 06:20:28 ubuntu plugininstall.py: return func(*args, **kwds)
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 470, in commit
Aug 21 06:20:28 ubuntu plugininstall.py: res = self._fetch_archives(fetcher, pm)
Aug 21 06:20:28 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 288, in _fetch_archives
Aug 21 06:20:28 ubuntu plugininstall.py: raise LockFailedException("Failed to lock %s" % lockfile)
Aug 21 06:20:28 ubuntu plugininstall.py: LockFailedException: Failed to lock /target/var/cache/apt/archives/lock
Aug 21 06:20:28 ubuntu plugininstall.py: