Turns out lightdm is working after all, almost. If you wait patiently when the black screen appears after the Ubuntu 5 dots boot screen, possibly as much as 4 minutes, then the desktop eventually appears, albeit somewhat messed up, with a message box asking you to "unlock the login keychain" because it "was not unlocked when you logged in". After entering the password, the desktop is redrawn correctly and everything works. I'm still on kernel 4.15.0.24. It seems lightdm is just very slow as noted by njsf.
I think, if you touch the mouse during this black screen period, the login screen appears and, if you login you see a black screen for several seconds then it logs you out again. A cycle you can't get out of. That's what led to my comment that lightdm wasn't working for me. Daniel, I will create a bug of my own. Thanks for the explanation. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1779476 Title: Ubuntu 18.04: gdm3 does not switch to graphics after update Status in gdm3 package in Ubuntu: Incomplete Status in linux package in Ubuntu: Incomplete Bug description: After update of gdm and kernel gdm3 no longer enables graphics. What happens: ============= With and without: WaylandEnable=false in /etc/gdm3/custom.conf gdm3 does not switch to graphics. In both cases I case the X process running (Xwayland or Xorg) but no vt has it. lightdm does work, but barely. It takes up to a minute to get to the login screen. What I expected to happen: ========================== gdm3 switching to graphics in ~20 after boot like pre-update. Release: ======== $ lsb_release -rd Description: Ubuntu 18.04 LTS Release: 18.04 $ apt-cache policy kernel-common gdm3 lightdm xorg xwayland kernel-common: Installed: (none) Candidate: 13.018+nmu1 Version table: 13.018+nmu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 500 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages gdm3: Installed: 3.28.2-0ubuntu1.3 Candidate: 3.28.2-0ubuntu1.3 Version table: *** 3.28.2-0ubuntu1.3 500 500 http://us.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 100 /var/lib/dpkg/status 3.28.2-0ubuntu1.2 500 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 3.28.0-0ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages lightdm: Installed: 1.26.0-0ubuntu1 Candidate: 1.26.0-0ubuntu1 Version table: *** 1.26.0-0ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 100 /var/lib/dpkg/status xorg: Installed: 1:7.7+19ubuntu7 Candidate: 1:7.7+19ubuntu7 Version table: *** 1:7.7+19ubuntu7 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status xwayland: Installed: 2:1.19.6-1ubuntu4 Candidate: 2:1.19.6-1ubuntu4 Version table: *** 2:1.19.6-1ubuntu4 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status Attaching journalctl -b. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 EcryptfsInUse: Yes InstallationDate: Installed on 2016-08-27 (673 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) NonfreeKernelModules: wl Package: gdm3 3.28.2-0ubuntu1.3 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18 Tags: bionic package-from-proposed Uname: Linux 4.15.0-24-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-05-05 (58 days ago) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo _MarkForUpload: True mtime.conffile..etc.gdm3.custom.conf: 2018-06-30T11:12:29.280424 --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 EcryptfsInUse: Yes InstallationDate: Installed on 2016-08-27 (674 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) NonfreeKernelModules: wl Package: linux PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18 Tags: bionic package-from-proposed Uname: Linux 4.15.0-24-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-05-05 (58 days ago) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo _MarkForUpload: True modified.conffile..etc.gdm3.custom.conf: [modified] mtime.conffile..etc.gdm3.custom.conf: 2018-06-30T11:12:29.280424 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1779476/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp