For some reason (I cannot remember) my root filesystem node "/" had the owner set to my user. I guess this used to work for some time. And some change in mutter or related packages made this break.
Changed back owner to root.root and system is now starting properly. Don't know what to say about the system failing in such an obscure way. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1806257 Title: gnome-shell excessive logging cannot bind to x11-unix Status in mutter package in Ubuntu: New Bug description: Since the latest mutter upgrade mutter:amd64 3.28.3-2~ubuntu18.04.1 to 3.28.3-2~ubuntu18.04.2 the login screen can no longer be reached. Following symptoms are observed * keypresses are not registered; cannot even toggle NUM/CAPS lock * gnome-shell taking 100% CPU * logging gigabytes of messages to syslog * power-button does work and system shuts down when pressed --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2015-12-29 (1069 days ago) InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) Package: mutter 3.28.3-2~ubuntu18.04.2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18 Tags: bionic Uname: Linux 4.15.0-39-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-02-17 (287 days ago) UserGroups: adm cdrom dip libvirt libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1806257/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

