package python3-distupgrade (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/python3/dist-packages/DistUpgrade/__init__.py', which is also in package python3-update-manager 1:0.164

[Anders Kaseorg]

Selecting previously unselected package python3-distupgrade.
Unpacking python3-distupgrade (from .../python3-distupgrade_1%3a0.165_all.deb) ...
dpkg: error processing /var/cache/apt/archives/python3-distupgrade_1%3a0.165_all.deb (--unpack):
 trying to overwrite '/usr/lib/python3/dist-packages/DistUpgrade/__init__.py', which is also in package python3-update-manager 1:0.164
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)

ProblemType: Package
DistroRelease: Ubuntu 12.10
Package: python3-distupgrade (not installed)
ProcVersionSignature: Ubuntu 3.5.0-2.2-generic 3.5.0-rc4
Uname: Linux 3.5.0-2-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.2.5-0ubuntu1
Architecture: amd64
Date: Mon Jul 2 14:26:32 2012
ErrorMessage: trying to overwrite '/usr/lib/python3/dist-packages/DistUpgrade/__init__.py', which is also in package python3-update-manager 1:0.164
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20101202)
SourcePackage: ubuntu-release-upgrader
Title: package python3-distupgrade (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/python3/dist-packages/DistUpgrade/__init__.py', which is also in package python3-update-manager 1:0.164
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeAptlog: Log time: 2011-11-16 13:29:53.604862

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[jerrylamos (jerrylamos)]

2 July doing apt-get dist-upgrade
.....
Errors were encountered while processing:
 /var/cache/apt/archives/python3-distupgrade_1%3a0.165_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

upgrade stopped at that point.

Jerry

[Szobonya Csaba (csaba215)]

In package python3-distupgrade_1%3a0.165_all.deb the following file is dummy one(empty) '/usr/lib/python3/dist-packages/DistUpgrade/__init__.py'. I think removing that file from the package would fix the issue.

[Anders Kaseorg (andersk)]

Szobonya, no, it’s more complicated than that. The empty __init__.py file is important to how the Python module loader works.

The solution is for python3-distupgrade to declare ‘Breaks: python3-update-manager (<< 1:0.165)’ and ‘Replaces: python3-update-manager (<< 1:0.165)’.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-release-upgrader - 1:0.170

---------------
ubuntu-release-upgrader (1:0.170) quantal; urgency=low

  [ Brian Murray ]
  * DistUpgrade/DistUpgradeMain.py: call clone.save_state with
    scrub_sources set so that VarLogDistUpgradeAptclonesystemstate can be
    included in bug reports again

  [ Colin Watson ]
  * Declare Breaks/Replaces from python3-distupgrade to old versions of
    python3-update-manager (LP: #1020229).

  [ Jeremy Bicha ]
  * data/release-upgrades:
    - set release upgrades default back to "normal" instead of "lts"
 -- Colin Watson <email address hidden> Tue, 10 Jul 2012 11:50:11 +0100