I had almost the same apt.log contents, but before the "Broken" list
there were some lines like the following:
libquadmath0:i386 Depends on gcc-5-base [ i386 ] <
5.5.0-12ubuntu1~14.04 > ( libs ) (= 5.4.0-6ubuntu1~16.04.10) can't be
satisfied!
It was due to conflict between gcc-5 package installed from
ubuntu-toolchain-r/test ppa. After I removed gcc-{5,6,7,8}-base, it finally
succeeded in calculation of upgrade.
If you still get this failure, look for other lines with " can't be satisfied"
in them inside /var/log/dist-upgrade/apt.log. They should point you to the bad
packages to remove before upgrade.
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https://bugs.launchpad.net/bugs/1662229
Title:
Cannot calculate upgrade from 14.04 to 16.04
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