I had the same issue with a gutsy (7.10) to hardy (8.04) upgrade. I used the
"modify /etc/apt/sources.list; apt-get update; apt-get dist-upgrade" method.
I have the sugar packages (which use Python) installed from
http://ppa.launchpad.net/jani/ubuntu , but I do not thing that was related.
The error looked something like this (see attached
var_log_apt_term.log):
Preparing to replace python-apt 0.7.3.1ubuntu4 (using
.../python-apt_0.7.4ubuntu5_i386.deb) ...
Traceback (most recent call last):
File "/usr/bin/pycentral", line 1593, in <module>
main()
File "/usr/bin/pycentral", line 1587, in main
rv = action.run(global_options)
File "/usr/bin/pycentral", line 1075, in run
requested = pyversions.requested_versions_for_runtime(version_field,
version_only=True)
File "/usr/share/pycentral-data/pyversions.py", line 172, in
requested_versions_for_runtime
vinfo = parse_versions(vstring)
File "/usr/share/pycentral-data/pyversions.py", line 58, in parse_versions
raise ValueError, 'error parsing Python-Version attribute'
ValueError: error parsing Python-Version attribute
After this, everything blew up. The install/upgrade would not continue,
because apt refused to configure any packages for which the dependencies
failed. (It's amazing how many packages are somehow dependant on
python). The system was unusable.
After poking around a bit, and using the above stack trace to get in a little
over my head, I commented out line 1587 of /usr/bin/pycentral, which says:
rv = action.run(global_options)
After this, apt agreed to configure the remaining packages. However, I
DO NOT RECOMMEND this approach, since it breaks some python packages.
Perhaps a try/catch block somewhere in this call stack would prevent the
error from upgrading this package. This might be a bug in python-
central
** Attachment added: "apt-get dist-upgrade for gutsy to hardy"
http://launchpadlibrarian.net/12177441/var_log_apt_term.log
--
Dapper->hardy upgrade failed during do-release-upgrade (apparently a python-apt
issue)
https://bugs.launchpad.net/bugs/194448
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