This sounds like a bug that was fixed earlier in 2018. Please try updating the machine and tell us if the problem still occurs.
** Package changed: xorg (Ubuntu) => gdm3 (Ubuntu) ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1759917 Title: after logout i can't login agin Status in gdm3 package in Ubuntu: Incomplete Bug description: after logout i can't login agin ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xorg 1:7.7+19ubuntu5 ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10 Uname: Linux 4.15.0-13-generic x86_64 ApportVersion: 2.20.9-0ubuntu2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None Date: Thu Mar 29 19:43:46 2018 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo HD Graphics 5500 [17aa:3824] InstallationDate: Installed on 2015-12-14 (836 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: LENOVO 80K6 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=73fd1edc-d964-40d3-a1dd-b1ca4118cce6 ro quiet splash vt.handoff=1 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/19/2015 dmi.bios.vendor: LENOVO dmi.bios.version: C2CN17WW(V1.03) dmi.board.asset.tag: No Asset Tag dmi.board.name: Lenovo Z51-70 dmi.board.vendor: LENOVO dmi.board.version: No DPK dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Z51-70 dmi.modalias: dmi:bvnLENOVO:bvrC2CN17WW(V1.03):bd03/19/2015:svnLENOVO:pn80K6:pvrLenovoZ51-70:rvnLENOVO:rnLenovoZ51-70:rvrNoDPK:cvnLENOVO:ct10:cvrLenovoZ51-70: dmi.product.family: IDEAPAD dmi.product.name: 80K6 dmi.product.version: Lenovo Z51-70 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1 version.libdrm2: libdrm2 2.4.91-2 version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 xserver.bootTime: Thu Mar 29 19:26:30 2018 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.19.6-1ubuntu3 xserver.video_driver: modeset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1759917/+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