I ran "apt-get install libapt-pkg4.12" manually, that pulled a bunch of
other updates including multiarch-support, then ran do-release-upgrade
again; I've got scary warnings and had to "apt-get -f install", "apt-get
upgrade" and "apt-get dist-upgrade" but eventially completed the upgrade
after multiple trials.
At some point I was stuck upgrading to python 2.7, apt-get install
python2.7-minimal said:
The following packages have unmet dependencies:
python-apt: Recommends: xz-lzma but it is not going to be installed
Breaks: apt-listchanges (< 2.85) but 2.84 is to be installed
so I passed -o APT::Immediate-Configure=0 to apt-get dist-upgrade and it
passed. Obviously this is a dangerous workaround as it delays configuration of
essential packages.
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https://bugs.launchpad.net/bugs/1002815
Title:
failed upgrade from 10.04.4 to 12.04
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