• Failed to Start Light Display Manager

    After updating and later starting the system it won’t boot anymore with “Failed to Start Light Display Manager” - systemctl status reports the same error message, with “Failed with result ‘exit-code’” and “status=1/failure”, but no other error messages, journalctl has no error messages at all only a ton of “the start-up result is RESULT.”. I tried some solutions offered in the forum like enabling, disabling lightdm, reinstalling it, nothing of that seemed to work, is there anything else I could/should try or could find an error message in?

  • Take a look at /var/log/lightdm/lightdm.log
    I think that one usually has some error messages that can be useful. At least someone on IRC have found some gold in there then having issues :P

    I don’t use lightdm though so not sure if there’s anything new going on.

  • @tiedemann ok so it contains:

    [LightDM] contains unknown option session-manager

    right after loading the lightdm.conf


    Failed to find session configuration slick-greeter
  • @clowntie Can you just paste the whole thing on https://paste.ee/ or some other place?

  • @tiedemann

    [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
    [+0.00s] DEBUG: Starting Light Display Manager 1.26.0, UID=0 PID=724
    [+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
    [+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
    [+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
    [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
    [+0.00s] DEBUG:   [LightDM] contains unknown option session-wrapper
    [+0.00s] DEBUG: Registered seat module local
    [+0.00s] DEBUG: Registered seat module xremote
    [+0.00s] DEBUG: Registered seat module unity
    [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
    [+0.01s] DEBUG: Monitoring logind for seats
    [+0.01s] DEBUG: New seat added from logind: seat0
    [+0.01s] DEBUG: Seat seat0: Loading properties from config section Seat:*
    [+0.01s] DEBUG: Seat seat0: Starting
    [+0.01s] DEBUG: Seat seat0: Creating greeter session
    [+0.01s] DEBUG: Seat seat0: Failed to find session configuration slick-greeter
    [+0.01s] DEBUG: Seat seat0: Failed to create greeter session
    [+0.01s] DEBUG: Failed to start seat: seat0
  • Check the /etc/lightdm/lightdm.conf. It should contain a line what defines the theme it should use.
    Mine is default so it has:

  • @tiedemann probably setting that to the default one will work again, but why did slick-greeter break? and I can’t reinstall slick-greeter because then it says dependencies break for itself

    @joekamprad do you have any issues too? since I remember you said you use slick-greeter too?

  • Try changing the line in /etc/lightdm/lightdm.conf to read:


    For some reason, this change is necessary after the latest update to slick-greeter.

  • @grenouille Thanks, that was it, they probably finally renamed the actual package to be the same as the one in the repo

  • @grenouille said in Failed to Start Light Display Manager:


    they only change the name of the session from slick-greeter to lightdm-slick-greeter
    here it works with changing this inside lightdm.conf like @grenouille say before.

    @ClownTie your log shows:
    [+0.00s] DEBUG: [LightDM] contains unknown option session-wrapper

    should be this:


    may you change wrong line?

  • @joekamprad I changed the slick-greeter name and it works again, should I still look into session-wrapper?

  • @clowntie you can check the entry inside lightdm.conf:

    cat /etc/lightdm/lightdm.conf | grep session-wrapper

    it should give out this:


  • @joekamprad yes it is set to that

  • i get also some debugging errors here may there are some options not needed anymore or not used anymore as leftovers inside config (lightdm.conf) i have also session-wrapper=/etc/lightdm/Xsession two times inside…

    And no issue at all on using it…

  • @joekamprad so I guess nothing to worry about then?

  • none of the options above work for me :-/

  • @kronikpillow do you use slick-greeter? if not open a new thread and give info on what exactly do not work and provide logs (journal /lightdm)

    for slick greeter:

    greeter-session=lightdm-slick-greeter inside /etc/lightdm/lightdm.conf


  • @joekamprad yes i tought i installed slick-greeter, but after failure to start it i switched back to web2 and figured out that I can’t build / install slick greeter it … i get this when trying to install https://pastebin.com/WKxLkrWi

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