upgrade to 12.04 Beta 1 update-manager-core install error because of symlink size change

[Mike Kupfer]

While upgrading a 32-bit VirtualBox VM from 11.10 to 12.04 Beta 1, I got a pop-up with the following error messages

  Could not install '/var/cache/apt/archives/update-manager-core_1%3a0.156.6_i386.deb'

  symbolic link '/usr/lib/python2.7/dist-packages/computerjanitor/exc_tests.py' size has changed from 78 to 73

NB: this bug report is being filed on the 3.0.0 kernel because of 946100.

Synaptic shows update-manager-core 1:0.156.6 in the list of upgradeable packages, but I get the same error when I try to install it.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager-core 1:0.152.25.8 [modified: usr/share/apport/package-hooks/source_update-manager.py usr/share/pyshared/DistUpgrade/DistUpgradeAufs.py usr/share/pyshared/DistUpgrade/DistUpgradeFetcherSelf.py usr/share/pyshared/DistUpgrade/sourceslist.py]
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic i686
ApportVersion: 1.94-0ubuntu1
Architecture: i386
Date: Sat Mar 3 22:20:20 2012
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-03-04 (0 days ago)

[Mike Kupfer (mkupfer37)]

Same problem with 1:0.156.7.

[Mike Kupfer (mkupfer37)]

Same problem with 1:0.156.8.

[Jean-Baptiste Lallement (jibel)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments? Thanks in advance.

[Mike Kupfer (mkupfer37)]

File 8 out of 8 in /var/log/dist-upgrade/.