The message comes from systemd-fsckd. Though I'm not sure why it would be considered a bug that the message shows up briefly on the screen; we always call systemd-fsckd, even if it quickly determines there's no work to do and exits.
** Package changed: plymouth (Ubuntu) => systemd (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1946192 Title: "Press Ctrl+C to cancel all filesystem checks in process" on every boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1946192/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs