Ah, i did not upgrade libapt-pkg5.0 as i wanted to leave some packages for the auto-upgrader test case.
Upgrading those two:
ii libapt-inst2.0:amd64 1.4.6~17.04.1 amd64 deb package format runtime library
ii libapt-pkg5.0:amd64 1.4.6~17.04.1 amd64 package management runtime library
I now get on zesty, no segfault for case #1 & error message for case #2, as expected.
Ah, i did not upgrade libapt-pkg5.0 as i wanted to leave some packages for the auto-upgrader test case.
Upgrading those two: inst2.0: amd64 1.4.6~17.04.1 amd64 deb package format runtime library
ii libapt-
ii libapt-pkg5.0:amd64 1.4.6~17.04.1 amd64 package management runtime library
I now get on zesty, no segfault for case #1 & error message for case #2, as expected.