Having not had any success with removing gnuradio, I tried removing other things, including the PPAs I had removed before (I was aiming to make one change at a tie to pin down the issue). It turns out that I had a non-Ubunutu standard versions of sane and some associated libraries. When I forced the version to be the one in bionic-update I was able to update successfully.
Thanks for the assistance. As always when one find the solution one wonders why one did not do that first :-( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1898152 Title: upgrade fails to calculate if gnuradio-dev is installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1898152/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
