Lucid -> Precise main failed to upgrade: ERROR: pycompile:Requested versions are not installed dpkg: error processing python2.7-minimal installed post-installation script returned error exit status 3

python-minimal is not yet unpacked, so the old pycompile is still used, which doesn't know about python2.7

another issue is that pycompile in lucid still has DEFAULT_VERSION = (2, 5), so changing this to 2.6 and re-running the upgrade would be interesting.

maybe this should be fixed independently.

update-manager 1:0.156.10 was uploaded on Apr 13 too, when this did start to fail, but the changes don't look that suspicious

I changed DEFAULT_VERSION to (2, 6) and upgrade failed again.

Here is the output with PYCOMPILE_DEBUG=1:
"""
Setting up python2.7-minimal (2.7.3-0ubuntu1) ...
DEBUG:pycompile:argv: ['/usr/bin/pycompile', '-V', '2.7', '/usr/lib/python2.7/dist-packages']
DEBUG:pycompile:options: {'regexpr': None, 'version_range': ((2, 7), (2, 7)), 'pyr_mode': False, 'verbose': True, 'package': None}
DEBUG:pycompile:args: ['/usr/lib/python2.7/dist-packages']
DEBUG:pycompile:requested versions: set([])
ERROR:pycompile:Requested versions are not installed
dpkg: error processing python2.7-minimal (--configure):
 subprocess installed post-installation script returned error exit status 3
"""

 - ok, so we need to figure out why python-minimal is not unpacked at this point.
 - or add the new pycompile into python2.7-minimal, and divert it, so that it's available, gross hack ...

> ok, so we need to figure out why python-minimal is not unpacked at this point.

Well, because nothing guarantees that it will be. python2.7-minimal doesn't depend on the newer python-minimal.

"Well, because nothing guarantees that it will be. python2.7-minimal doesn't depend on the newer python-minimal."

It can't, because python-minimal depends on python2.7-minimal and that would give us a dependency loop, right?

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/983981

I tested python 2.7.3-0ubuntu2 and the upgrade test "lucid main all i386" pass again.

pitti> doko_: if it's upgrade only, a 0-day SRU will do fine

This bug was fixed in the package python2.7 - 2.7.3-0ubuntu2

---------------
python2.7 (2.7.3-0ubuntu2) precise-proposed; urgency=low

  * python2.7-minimal: Conflict with python-minimal (<< 2.7.3). LP: #983981.
 -- Matthias Klose <email address hidden> Thu, 19 Apr 2012 16:07:47 +0200