And the results of git bisect, thanks for the excellent instruction and script!
cde5b485c9cdf0bfd5b6ea8e4973abe378270e60 is the first bad commit commit cde5b485c9cdf0bfd5b6ea8e4973abe378270e60 Author: David Kalnischkies <da...@kalnischkies.de> Date: Fri May 20 09:37:24 2016 +0200 fail instead of segfault on unreadable config files The report mentions "apt list --upgradable", but there are others which have inconsistent behavior ranging from segfaulting to doing something with the partial (and hence incomplete) data. We had a recent report about sources.list (#818628), this one mentions prefences, the obvious next step is conf files… so the testcase is adapted to check for all three in file and directory versions and run a bunch of commands each time which should all have more or less the same behavior in such a case (aka error out). Closes: 824503 (cherry picked from commit fdf9eef4d96a18d0167708499c993e1174251e88) :040000 040000 04f4856e0a9313f9f51a5a6dc56c9af005ac54f4 98d34296e4f9212a124515095f6ed9afd5739111 M apt-pkg :040000 040000 d48745d59ec9dd40087de492197c7a1060d1451d a5038f3b3730d8ba9e070f68a60af11fbe0e7ac3 M apt-private :040000 040000 cfb7d9b7f8130e98173cf09a56eea0c232cc75fa c2f0ed862e98021705643c42a1b549306b648c15 M cmdline :040000 040000 24d65ae746427999b728b85acb6969f509885cb1 82f28b27a48c3a6cf5b9caaf6434512a4a5dd79f M test bisect run success -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1642386 Title: At least one invalid signature was encountered. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1642386/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs