This should be closed. I found out that I had packages from a ppa
repository which were duplicates of standard ubuntu packages. So this
bug report should not even been submited.
Useful commands to solve this problem were:
for name in `dpkg -l | gawk -e '{print $2}'` ; do apt-cache policy $name; done
| grep ppa
ppa-purge ppa:ubuntugis
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https://bugs.launchpad.net/bugs/1900916
Title:
upgrade to latest stable release fails
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