Finally found what changed. I updated /etc/fstab to have /proc mounted with hidepid=2,gid=sudo for added security. This works perfectly on 16.04 but totally breaks on 17.10.
To recap: mounting /proc with "nodev,noexec,nosuid" works but adding "hidepid=2,gid=sudo" breaks. ** Tags added: regression -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1754401 Title: mounting /proc with hidepid causes: Fatal server error: (EE) xf86OpenConsole: Cannot open virtual console 1 (Permission denied) Status in gdm3 package in Ubuntu: New Status in xorg-server package in Ubuntu: New Bug description: I don't what changed but today, my Artful laptop refuses to start a graphical session. The last update seems entirely unrelated: # /var/log/apt/history.log Start-Date: 2018-03-06 15:50:35 Commandline: apt-get dist-upgrade Requested-By: simon (1000) Upgrade: libpq5:amd64 (9.6.7-0ubuntu0.17.10, 9.6.8-0ubuntu0.17.10) End-Date: 2018-03-06 15:50:39 I tried linux-image-4.13.0-32-generic and linux- image-4.13.0-36-generic to no avail. I removed the "quiet splash" args from /etc/default/grub but it didn't help. Using "nomodeset" makes the graphical session almost work but the brightness of the screen is so low that I cannot use it and can't make it brighter either. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gdm3 3.26.1-3ubuntu3 ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13 Uname: Linux 4.13.0-36-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 Date: Thu Mar 8 11:08:35 2018 InstallationDate: Installed on 2017-10-21 (137 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1754401/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
