I had the same problem which can be easily reproduced this way: I am logged in on PC A with user “olaf”. Using ssh I log in at PC B with user “chief” and start x: olaf@A: ssh chief@B olaf@A: sudo startx X-Session really starts up on B which I can see. Then I press ctrl+c … connection to x server lost
Now I move over to PC B and want to login with user “chief”. I can't get passed the login screen. In /var/log/lightdm/lightdm.log I found the following: [+10.72s] DEBUG: Session pid=1556: Greeter connected version=1.16.7 resettable=false [+10.91s] DEBUG: Session pid=1556: Greeter start authentication for chief [+10.91s] DEBUG: Session pid=1609: Started with service 'lightdm', username 'chief' [+10.92s] DEBUG: Session pid=1609: Got 1 message(s) from PAM [+10.92s] DEBUG: Session pid=1556: Prompt greeter with 1 message(s) [+23.13s] DEBUG: Session pid=1556: Greeter start authentication for olaf [+23.13s] DEBUG: Session pid=1609: Sending SIGTERM [+23.13s] DEBUG: Session pid=1777: Started with service 'lightdm', username 'olaf' [+23.13s] DEBUG: Session pid=1609: Terminated with signal 15 [+23.13s] DEBUG: Session: Failed during authentication [+23.13s] DEBUG: Seat seat0: Session stopped It seems that lightdm wants to login with user “olaf” and the password I just entered (Greeter start authentication for olaf). Of course this will fail on PC B. Deleting the file Xauthority in the home of user chief on PC B will allow me to login again as chief: chief@B: mv ~/.Xauthority -- You received this bug notification because you are a member of LightDM Gtk+ Greeter Development Team, which is subscribed to lightdm-gtk- greeter in Ubuntu. https://bugs.launchpad.net/bugs/1312526 Title: Greeter uses previous session even if it is not available Status in lightdm-gtk-greeter package in Ubuntu: Confirmed Status in unity-greeter package in Ubuntu: Triaged Bug description: I install using preseed files, and clobber a bit of /etc to configure ubuntu to be suitable for users to login with network credentials. I use pam to make a home directory when users login with network credentials. On first boot, logging into the VTs works fine but I cannot log into the lightdm dislpay manager. If I type my username and password right, I get a "Failed to start session" message and get bounced back to the start of the login process. If, however, I click one of the session types, e.g. 'ubuntu' or 'fluxbox', then I can log in. (I've tried uninstalling fluxbox, this doesn't seem to help). At which point I can login, which I believe works until I reboot the machine. (I will test this shortly). If I install the lightdm-gtk-greeter package then I do not encounter this bug. Instead, I am automatically logged into the alphabetically first session type (at least, if I've got fluxbox available vs. either ubuntu or xfce, that seems to be what I get, if only ubuntu is install I get an ubunut session by default so I assume the preference is alphabetical). It does not seem to matter if I specify a user-session=something (I have also tried not setting user-session at all) in lightdm.conf (well, I haven't tried it with the gtk-greeter, but it doesn't matter with the unity greeter). I've tried all of the other lightdm-greeter packages, and lightdm- greeter-gtk is the only one that does not suffer from this bug. the most relvant message in the logs I can find is: DEBUG: Seat: Failed to find session configuration true Seat: Can't find session 'true' What I would expect to happen is to get some default session; getting the alphabetically first session is kind-of/sort-of reasonable. Total failure is not. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.10.0-0ubuntu3 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 NonfreeKernelModules: openafs ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CurrentDesktop: Unity Date: Thu Apr 24 22:08:08 2014 LightdmConfig: [SeatDefaults] user-session=true greeter-hide-users=true greeter-allow-guest=false session-setup-script=/bin/sh -l /etc/profile SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1312526/+subscriptions -- Mailing list: https://launchpad.net/~lightdm-gtk-greeter-team Post to : lightdm-gtk-greeter-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~lightdm-gtk-greeter-team More help : https://help.launchpad.net/ListHelp
