I did a git bisect on the source and it identified this upstream commit as being the potential culprit: https://salsa.debian.org/apt- team/apt/commit/1adcf56bec7d2127d83aa423916639740fe8e586
I can confirm that this is the culprit by testing the output of `apt- cdrom add` before and after reverting that specific commit from the tip of master. On further analysis, the following diff is the problematic one: - for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressor.begin(); - c != compressor.end(); ++c) + for (auto const &ext: APT::Configuration::getCompressorExtensions()) { - if (stat((file + c->Extension).c_str(), &Buf) != 0) + if (stat((file + ext).c_str(), &Buf) != 0) Reverting that diff and that diff only fixes `apt-cdrom add`. Julian, could you take a look at why this is problematic? I'm afraid I don't have the expertise to proceed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1746807 Title: 18.04 daily installer fails missing kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1746807/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs