Here is the output from journalctl (extra spacing around probably the most interesting line). Also when I got back to the login screen, I very briefly saw a message under the password form saying 'Authentication error'.
/usr/lib/gdm3/gdm-x-session[1915]: (II) UnloadModule: "libinput" /usr/lib/gdm3/gdm-x-session[1915]: (II) systemd-logind: releasing fd for 13:65 /usr/lib/gdm3/gdm-x-session[1915]: (II) UnloadModule: "libinput" /usr/lib/gdm3/gdm-x-session[1915]: (II) systemd-logind: releasing fd for 13:69 /usr/lib/gdm3/gdm-x-session[1915]: (II) UnloadModule: "libinput" /usr/lib/gdm3/gdm-x-session[1915]: (II) systemd-logind: releasing fd for 13:67 PackageKit[1352]: search-file transaction /372_adaeccdc from uid 1000 finished with success after 602ms /usr/lib/gdm3/gdm-x-session[1915]: (II) Server terminated successfully (0). Closing log file. gdm-password][1906]: pam_unix(gdm-password:session): session closed for user chris gnome-shell[1128]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed systemd[1]: Starting Stop ureadahead data collection... systemd[1]: Started Stop ureadahead data collection. gdm-password][2437]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=chris systemd-logind[904]: Removed session 4. gdm-password][2440]: pam_unix(gdm-password:session): session opened for user chris by (uid=0) systemd-logind[904]: New session 5 of user chris. systemd[1]: Started Session 5 of user chris. gnome-shell[1128]: g_dbus_connection_call_sync_internal: assertion 'G_IS_DBUS_CONNECTION (connection)' failed kernel: xhci_hcd 0000:39:00.0: remove, state 4 kernel: usb usb4: USB disconnect, device number 1 kernel: xhci_hcd 0000:39:00.0: USB bus 4 deregistered kernel: xhci_hcd 0000:39:00.0: xHCI host controller not responding, assume dead kernel: xhci_hcd 0000:39:00.0: remove, state 4 kernel: usb usb3: USB disconnect, device number 1 kernel: xhci_hcd 0000:39:00.0: Host halt failed, -19 kernel: xhci_hcd 0000:39:00.0: Host not accessible, reset failed. kernel: xhci_hcd 0000:39:00.0: USB bus 3 deregistered upowerd[1133]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:02.0/0000:39:00.0/usb4/4-0:1.0 upowerd[1133]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:02.0/0000:39:00.0/usb3/3-0:1.0 boltd[1351]: [d4030000-0092-XPS13 9360 ] removed (/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:00.0/0000:03:00.0/domain0/0-0) upowerd[1133]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:02.0/0000:39:00.0/usb3 boltd[1351]: [d4030000-0092-XPS13 9360 ] dbus: unexported upowerd[1133]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:02.0/0000:39:00.0/usb4 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1766137 Title: [regression] Login fails when preceded by incorrect password Status in gdm3 package in Ubuntu: Incomplete Status in gnome-shell package in Ubuntu: Incomplete Bug description: Trying to log into my session (Gnome, Xorg), if I enter the wrong password before entering it correctly, the session doesn't load and I get a purple screen, a mouse cursor, and an invisible but clickable menu in the top right. If I enter it correctly the first time, there is no problem. I've replicated this from a fresh boot, after logging out and after 'sudo service gdm restart' from the Ctrl-Alt-F4 console. This is a fresh install, and didn't occur when I was using a previous install of 18.04 (until Friday). ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gdm3 3.28.0-0ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 ApportVersion: 2.20.9-0ubuntu6 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Apr 22 20:31:13 2018 InstallationDate: Installed on 2018-04-22 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180421.1) 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/1766137/+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

