Same issue for me on my Thinkpad W530. After the upgrade from 14.04 to 14.10 the PC was working with the Intel integrated graphics card but not with the discrete Nvidia one (as usual after any kernel update...). When reinstalling the Nvidia drivers the problem appeared. Subsequently, I can login graphically when using the integrated graphics card (selected in the BIOS) but I have no dash. When using the discrete graphics card, I get a black screen and the system asks to run in low-graphics mode (but without success). Hope this helps.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd-shim in Ubuntu. https://bugs.launchpad.net/bugs/1359439 Title: [ 7.287663] systemd-logind[1057]: Failed to start unit user@126.service: Unknown unit: user@126.service Status in systemd-shim package in Ubuntu: In Progress Status in systemd-shim package in Debian: New Bug description: [ 7.287663] systemd-logind[1057]: Failed to start unit user@126.service: Unknown unit: user@126.service [ 7.287677] systemd-logind[1057]: Failed to start user service: Unknown unit: user@126.service [ 7.293871] systemd-logind[1057]: New session c1 of user lightdm. [ 7.293902] systemd-logind[1057]: Linked /tmp/.X11-unix/X0 to /run/user/126/X11-display. [ 7.363706] ip_tables: (C) 2000-2006 Netfilter Core Team [ 7.421846] nf_conntrack version 0.5.0 (16384 buckets, 65536 max) [ 7.484529] IPv6: ADDRCONF(NETDEV_UP): virbr0: link is not ready [ 9.903052] wlan0: authenticate with c8:d7:19:22:21:ec [ 9.912429] wlan0: send auth to c8:d7:19:22:21:ec (try 1/3) [ 9.920181] wlan0: authenticated [ 9.924352] wlan0: associate with c8:d7:19:22:21:ec (try 1/3) [ 9.925709] wlan0: RX AssocResp from c8:d7:19:22:21:ec (capab=0x11 status=0 aid=2) [ 9.927753] wlan0: associated [ 9.927800] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 12.677104] systemd-logind[1057]: Failed to abandon scope session-c1.scope [ 12.677122] systemd-logind[1057]: Failed to abandon session scope: No such interface 'org.freedesktop.systemd1.Scope' on object at path /org/freedesktop/systemd1/unit/session_2dc1_2escope [ 12.683902] systemd-logind[1057]: Failed to start unit user@1000.service: Unknown unit: user@1000.service [ 12.683912] systemd-logind[1057]: Failed to start user service: Unknown unit: user@1000.service [ 12.685157] systemd-logind[1057]: New session c2 of user caravena. [ 12.685190] systemd-logind[1057]: Linked /tmp/.X11-unix/X0 to /run/user/1000/X11-display. [ 234.494462] systemd-logind[1057]: Failed to abandon scope session-c2.scope [ 234.494478] systemd-logind[1057]: Failed to abandon session scope: No such interface 'org.freedesktop.systemd1.Scope' on object at path /org/freedesktop/systemd1/unit/session_2dc2_2escope [ 235.514349] systemd-logind[1057]: New session c3 of user lightdm. [ 244.245908] systemd-logind[1057]: Failed to abandon scope session-c3.scope [ 244.245923] systemd-logind[1057]: Failed to abandon session scope: No such interface 'org.freedesktop.systemd1.Scope' on object at path /org/freedesktop/systemd1/unit/session_2dc3_2escope ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: systemd 208-7ubuntu4 [modified: usr/share/dbus-1/system-services/org.freedesktop.systemd1.service] ProcVersionSignature: Ubuntu 3.16.0-9.14-generic 3.16.1 Uname: Linux 3.16.0-9-generic x86_64 ApportVersion: 2.14.6-0ubuntu2 Architecture: amd64 CurrentDesktop: LXDE Date: Wed Aug 20 18:26:06 2014 InstallationDate: Installed on 2014-04-27 (115 days ago) InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd-shim/+bug/1359439/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp