** Merge proposal linked: https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/479519
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/2078720 Title: Upgrading from jammy to noble results in a linux-headers package being in a broken state Status in apt package in Ubuntu: Fix Released Status in linux-aws package in Ubuntu: Confirmed Status in linux-gcp package in Ubuntu: Confirmed Status in ubuntu-release-upgrader package in Ubuntu: Fix Released Status in apt source package in Jammy: Fix Released Status in linux-aws source package in Jammy: New Status in linux-gcp source package in Jammy: New Status in apt source package in Noble: New Status in linux-aws source package in Noble: New Status in linux-gcp source package in Noble: New Status in ubuntu-release-upgrader source package in Noble: Fix Released Bug description: (For APT SRU versioning, see https://wiki.ubuntu.com/AptUpdates) [Impact] Obsolete packages can be removed despite still having reverse dependencies installed, for example: Now that 24.04.1 has been released, 22.04 users are encouraged to upgrade to 24.04 via the `do-release-upgrade` command. This issue was seen whilst testing this upgrade path. Upgrading and later rebooting a jammy GCP instance results in `linux-headers-6.5.0-1025-gcp` being a broken state. ``` $ sudo apt install Reading package lists... Done Building dependency tree... Done Reading state information... Done You might want to run 'apt --fix-broken install' to correct these. The following packages have unmet dependencies: linux-headers-6.5.0-1025-gcp : Depends: linux-gcp-6.5-headers-6.5.0-1025 but it is not installable E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution). ``` `linux-gcp-6.5-headers-6.5.0-1025` is a dependency of `linux-image-6.5.0-1025-gcp` which is also not removed during the upgrade. ``` $ apt-cache rdepends linux-headers-6.5.0-1025-gcp linux-headers-6.5.0-1025-gcp Reverse Depends: linux-image-6.5.0-1025-gcp $ apt-cache rdepends linux-image-6.5.0-1025-gcp linux-image-6.5.0-1025-gcp Reverse Depends: ``` Running `apt --fix-broken install` resolves the error. ``` $ sudo apt --fix-broken install Reading package lists... Done Building dependency tree... Done Reading state information... Done Correcting dependencies... Done The following packages will be REMOVED: linux-headers-6.5.0-1025-gcp 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. After this operation, 27.9 MB disk space will be freed. Do you want to continue? [Y/n] y (Reading database ... 83770 files and directories currently installed.) Removing linux-headers-6.5.0-1025-gcp (6.5.0-1025.27~22.04.1) ... $ sudo apt install Reading package lists... Done Building dependency tree... Done Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. ``` This issue was also observed after upgrading a jammy AWS instance to noble. ``` $ sudo apt install Reading package lists... Done Building dependency tree... Done Reading state information... Done You might want to run 'apt --fix-broken install' to correct these. The following packages have unmet dependencies: linux-headers-6.5.0-1024-aws : Depends: linux-aws-6.5-headers-6.5.0-1024 but it is not installable E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution). ``` [Test plan] ## Jammy APT verification To prepare the VMs, follow the following scheme: $ lxc launch ubuntu:jammy jammy-to-noble --vm If using lxc shell or exec to connect to it, also perform the step below: $ lxc exec jammy-to-noble apt-mark lxd-agent-launcher # otherwise it resets On this jammy VM, edit /etc/update-manager/release-upgrades and set Prompt to "normal" (since release upgrades to noble via the lts prompt are temporarily blocked due to this bug) If this test run is meant to test the fix, then at this point you should install apt from jammy proposed. Otherwise, continue directly with the release upgrade. Then to continue with the test, proceed to the release upgrade: $ sudo do-release-upgrade Check that currently booted linux-headers- are *not* removed as obsolete. After the reboot at the end, in the rebooted system, issue: $ sudo apt upgrade With the bug present, you will get an error like this: $ sudo apt upgrade Reading package lists... Done Building dependency tree... Done Reading state information... Done You might want to run 'apt --fix-broken install' to correct these. The following packages have unmet dependencies: linux-headers-5.15.0-1065-kvm : Depends: linux-kvm-headers-5.15.0-1065 but it is not installable E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution). ## Noble APT verification To validate the APT change on noble, we must rely on the test suite as we won't have a noble->oracular upgrade bug causing it, most likely. To validate an ubuntu-release-upgrader change, instead run: ubuntu@jammy-to-noble$ do-release-upgrade -p ubuntu@mantic-to-noble$ do-release-upgrade -p [Where problems could occur: APT SRU] For the APT change, the function in question is used in a small number of places: In APT library: - In the `upgrade` command and library function. Removals are already undone there before calling it so we never reach the new code path. - In the phased update implementation, during dist-upgrade. I expect a failure is lurking there that is fixed by this, but I haven't been able to write a reproducer to trigger it just yet. In aptitude: - The function is wrapped, but the wrapper never called In QApt: - QApt seems to rely on it for upgrading and doesn't seem to have any error checking of the return value. I expect it will read the error [Where problems could occur: u-r-u SRU] Upgrades will now result in a consistent state, but may spend hours searching for obsolete software again. 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