Today it happened again and I have attached a screenshot here. As said, after a ctrl-alt-delete the system booted ok and I can see no sign of the failed disk in the logs.
** Attachment added: "IMG_20181114_081408_739.jpg" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1802469/+attachment/5212555/+files/IMG_20181114_081408_739.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1802469 Title: after upgrade to 18.04 the system sometimes just boots into emergency mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1802469/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs