Looking at .var.apt.history.log.txt we can see that in a previous package operation linux-generic was removed.
Start-Date: 2018-08-14 13:37:10 Commandline: apt dist-upgrade Install: linux-headers-4.15.0-32-generic:amd64 (4.15.0-32.35, automatic), linux-headers-4.15.0-32:amd64 (4.15.0-32.35, automatic) Upgrade: linux-headers-generic:amd64 (4.15.0.31.33, 4.15.0.32.34), linux-libc-dev:amd64 (4.15.0-31.33, 4.15.0-32.35) Remove: linux-signed-generic:amd64 (4.15.0.31.33), linux-generic:amd64 (4.15.0.31.33) End-Date: 2018-08-14 13:37:16 Subsequently during the unattended-upgrades run linux-image-generic is identified as an unused package. I'm only able to recreate this if I first remove the linux-generic package e.g.: bdmurray@clean-bionic-amd64:~$ sudo apt remove linux-generic [sudo] password for bdmurray: Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: amd64-microcode intel-microcode iucode-tool linux-headers-generic linux-image-generic thermald Use 'sudo apt autoremove' to remove them. The following packages will be REMOVED: linux-generic 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. After this operation, 15.4 kB disk space will be freed. Do you want to continue? [Y/n] Y (Reading database ... 165999 files and directories currently installed.) Removing linux-generic (4.15.0.30.32) ... bdmurray@clean-bionic-amd64:~$ sudo unattended-upgrades -v Initial blacklisted packages: Initial whitelisted packages: Starting unattended upgrades script Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESM,a=bionic Removing unused kernel packages: linux-headers-generic linux-image-generic (Reading database ... 165996 files and directories currently installed.) Removing linux-headers-generic (4.15.0.30.32) ... (Reading database ... 165993 files and directories currently installed.) Removing linux-image-generic (4.15.0.30.32) ... Packages that were successfully auto-removed: linux-headers-generic linux-image-generic Packages that are kept back: No packages found that can be upgraded unattended and no pending auto-removals -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1787460 Title: Unattended upgrades removed linux-image-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1787460/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
