installer crashes with LockFailedException

[Fabio Marconi]

Hello
Performing an instalation of Lubuntu, with updates during, ubiquity crash.
Thanks
Fabio

**WORKAROUND**
Disable networking

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity 2.7.14
ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0
Uname: Linux 3.0.0-7-generic x86_64
Architecture: amd64
CasperVersion: 1.277
Date: Thu Aug 11 22:08:26 2011
LiveMediaBuild: Lubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110807)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Fabio Marconi (fabiomarconi)]

ubuntu plugininstall.py: Traceback (most recent call last):
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1659, in <module>
Aug 11 22:07:48 ubuntu plugininstall.py: install.run()
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Aug 11 22:07:48 ubuntu plugininstall.py: func(self)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 209, in run
Aug 11 22:07:48 ubuntu plugininstall.py: self.remove_extras()
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1415, in remove_extras
Aug 11 22:07:48 ubuntu plugininstall.py: self.do_remove(regular)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1017, in do_remove
Aug 11 22:07:48 ubuntu plugininstall.py: if not cache.commit(fetchprogress, installprogress):
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/deprecation.py", line 98, in deprecated_function
Aug 11 22:07:48 ubuntu plugininstall.py: return func(*args, **kwds)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 470, in commit
Aug 11 22:07:48 ubuntu plugininstall.py: res = self._fetch_archives(fetcher, pm)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 288, in _fetch_archives
Aug 11 22:07:48 ubuntu plugininstall.py: raise LockFailedException("Failed to lock %s" % lockfile)
Aug 11 22:07:48 ubuntu plugininstall.py: LockFailedException: Failed to lock /target/var/cache/apt/archives/lock
Aug 11 22:07:48 ubuntu plugininstall.py:
Aug 11 20:08:30 ubuntu NetworkManager[2668]: nm_supplicant_config_get_pkcs11_engine_path: assertion `NM_IS_SUPPLICANT_CONFIG (self)' failed
Aug 11 20:08:30 ubuntu NetworkManager[2668]: nm_supplicant_config_get_pkcs11_module_path: assertion `NM_IS_SUPPLICANT_CONFIG (self)' failed
Aug 11 20:09:30 ubuntu NetworkManager[2668]: nm_supplicant_config_get_pkcs11_engine_path: assertion `NM_IS_SUPPLICANT_CONFIG (self)' failed
Aug 11 20:09:30 ubuntu NetworkManager[2668]: nm_supplicant_config_get_pkcs11_module_path: assertion `NM_IS_SUPPLICANT_CONFIG (self)' failed

[Brian Murray (brian-murray)]

Exception during installation:
Aug 11 22:07:48 ubuntu plugininstall.py: Traceback (most recent call last):
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1659, in <module>
Aug 11 22:07:48 ubuntu plugininstall.py: install.run()
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Aug 11 22:07:48 ubuntu plugininstall.py: func(self)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 209, in run
Aug 11 22:07:48 ubuntu plugininstall.py: self.remove_extras()
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1415, in remove_extras
Aug 11 22:07:48 ubuntu plugininstall.py: self.do_remove(regular)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1017, in do_remove
Aug 11 22:07:48 ubuntu plugininstall.py: if not cache.commit(fetchprogress, installprogress):
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/deprecation.py", line 98, in deprecated_function
Aug 11 22:07:48 ubuntu plugininstall.py: return func(*args, **kwds)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 470, in commit
Aug 11 22:07:48 ubuntu plugininstall.py: res = self._fetch_archives(fetcher, pm)
Aug 11 22:07:48 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 288, in _fetch_archives
Aug 11 22:07:48 ubuntu plugininstall.py: raise LockFailedException("Failed to lock %s" % lockfile)
Aug 11 22:07:48 ubuntu plugininstall.py: LockFailedException: Failed to lock /target/var/cache/apt/archives/lock
Aug 11 22:07:48 ubuntu plugininstall.py: