Reconfigure the display-manager non-interactively












0















I am trying to change the default display-manager on a Ubuntu 18.04.1 in a non-interactive way to do this in a script.



Everything works as expected when using




  • dpkg-reconfigure gdm3

  • dpkg-reconfigure lightdm


I tried setting shared/default-x-display-manager to a valid display-manager and run dpkg-reconfigure, but that did not do the trick.




First check which display-manager is set.



root@host:~# cat /etc/X11/default-display-manager

/usr/sbin/gdm3

root@host:~# cat /etc/X11/default-display-manager

/usr/sbin/gdm3



Then set shared/default-x-display-manager to lightdm and validate it.



root@host:~# echo set shared/default-x-display-manager lightdm | debconf-communicate 

0 value set

root@host:~# echo get shared/default-x-display-manager | debconf-communicate 

0 lightdm



Finally run dpkg-reconfigure --frontend noninteractive lightdm and check which display-manager is active. Which unfortunately is gdm3 again.



root@host:~# dpkg-reconfigure --frontend noninteractive lightdm

root@host:~# echo get shared/default-x-display-manager | debconf-communicate 

0 gdm3

root@host:~# cat /etc/X11/default-display-manager 

/usr/sbin/gdm3

root@host:~# ll /etc/systemd/system/display-manager.service

lrwxrwxrwx 1 root root 32 Jan 31 20:03 /etc/systemd/system/display-manager.service -> /lib/systemd/system/gdm3.service



The same happens if I want to switch from lightdm to gdm3.

Anything I am missing here or is this not intended to work at all?



I have seen in the scripts for gdm3 that if there is a /etc/X11/default-display-manager.debconf-update file, the systemd unit and the /etc/X11/default-display-manager are updated accordingly.

Unfortunately this does not work for lightdm as this one uses some other method(s) to do the work.



Hope someone else can shed some light on this and knows a convenient way to configure the display-manager non-interactively.






18.04 lightdm gdm display-manager







share|improve this question



























    0















    I am trying to change the default display-manager on a Ubuntu 18.04.1 in a non-interactive way to do this in a script.



    Everything works as expected when using




    • dpkg-reconfigure gdm3

    • dpkg-reconfigure lightdm


    I tried setting shared/default-x-display-manager to a valid display-manager and run dpkg-reconfigure, but that did not do the trick.




    First check which display-manager is set.



    root@host:~# cat /etc/X11/default-display-manager
    
/usr/sbin/gdm3
    
root@host:~# cat /etc/X11/default-display-manager
    
/usr/sbin/gdm3



    Then set shared/default-x-display-manager to lightdm and validate it.



    root@host:~# echo set shared/default-x-display-manager lightdm | debconf-communicate 
    
0 value set
    
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
    
0 lightdm



    Finally run dpkg-reconfigure --frontend noninteractive lightdm and check which display-manager is active. Which unfortunately is gdm3 again.



    root@host:~# dpkg-reconfigure --frontend noninteractive lightdm
    
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
    
0 gdm3
    
root@host:~# cat /etc/X11/default-display-manager 
    
/usr/sbin/gdm3
    
root@host:~# ll /etc/systemd/system/display-manager.service
    
lrwxrwxrwx 1 root root 32 Jan 31 20:03 /etc/systemd/system/display-manager.service -> /lib/systemd/system/gdm3.service



    The same happens if I want to switch from lightdm to gdm3.

    Anything I am missing here or is this not intended to work at all?



    I have seen in the scripts for gdm3 that if there is a /etc/X11/default-display-manager.debconf-update file, the systemd unit and the /etc/X11/default-display-manager are updated accordingly.

    Unfortunately this does not work for lightdm as this one uses some other method(s) to do the work.



    Hope someone else can shed some light on this and knows a convenient way to configure the display-manager non-interactively.






    18.04 lightdm gdm display-manager







    share|improve this question

























      0












      0








      0








      I am trying to change the default display-manager on a Ubuntu 18.04.1 in a non-interactive way to do this in a script.



      Everything works as expected when using




      • dpkg-reconfigure gdm3

      • dpkg-reconfigure lightdm


      I tried setting shared/default-x-display-manager to a valid display-manager and run dpkg-reconfigure, but that did not do the trick.




      First check which display-manager is set.



      root@host:~# cat /etc/X11/default-display-manager
      
/usr/sbin/gdm3
      
root@host:~# cat /etc/X11/default-display-manager
      
/usr/sbin/gdm3



      Then set shared/default-x-display-manager to lightdm and validate it.



      root@host:~# echo set shared/default-x-display-manager lightdm | debconf-communicate 
      
0 value set
      
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
      
0 lightdm



      Finally run dpkg-reconfigure --frontend noninteractive lightdm and check which display-manager is active. Which unfortunately is gdm3 again.



      root@host:~# dpkg-reconfigure --frontend noninteractive lightdm
      
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
      
0 gdm3
      
root@host:~# cat /etc/X11/default-display-manager 
      
/usr/sbin/gdm3
      
root@host:~# ll /etc/systemd/system/display-manager.service
      
lrwxrwxrwx 1 root root 32 Jan 31 20:03 /etc/systemd/system/display-manager.service -> /lib/systemd/system/gdm3.service



      The same happens if I want to switch from lightdm to gdm3.

      Anything I am missing here or is this not intended to work at all?



      I have seen in the scripts for gdm3 that if there is a /etc/X11/default-display-manager.debconf-update file, the systemd unit and the /etc/X11/default-display-manager are updated accordingly.

      Unfortunately this does not work for lightdm as this one uses some other method(s) to do the work.



      Hope someone else can shed some light on this and knows a convenient way to configure the display-manager non-interactively.






      18.04 lightdm gdm display-manager







      share|improve this question














      I am trying to change the default display-manager on a Ubuntu 18.04.1 in a non-interactive way to do this in a script.



      Everything works as expected when using




      • dpkg-reconfigure gdm3

      • dpkg-reconfigure lightdm


      I tried setting shared/default-x-display-manager to a valid display-manager and run dpkg-reconfigure, but that did not do the trick.




      First check which display-manager is set.



      root@host:~# cat /etc/X11/default-display-manager
      
/usr/sbin/gdm3
      
root@host:~# cat /etc/X11/default-display-manager
      
/usr/sbin/gdm3



      Then set shared/default-x-display-manager to lightdm and validate it.



      root@host:~# echo set shared/default-x-display-manager lightdm | debconf-communicate 
      
0 value set
      
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
      
0 lightdm



      Finally run dpkg-reconfigure --frontend noninteractive lightdm and check which display-manager is active. Which unfortunately is gdm3 again.



      root@host:~# dpkg-reconfigure --frontend noninteractive lightdm
      
root@host:~# echo get shared/default-x-display-manager | debconf-communicate 
      
0 gdm3
      
root@host:~# cat /etc/X11/default-display-manager 
      
/usr/sbin/gdm3
      
root@host:~# ll /etc/systemd/system/display-manager.service
      
lrwxrwxrwx 1 root root 32 Jan 31 20:03 /etc/systemd/system/display-manager.service -> /lib/systemd/system/gdm3.service



      The same happens if I want to switch from lightdm to gdm3.

      Anything I am missing here or is this not intended to work at all?



      I have seen in the scripts for gdm3 that if there is a /etc/X11/default-display-manager.debconf-update file, the systemd unit and the /etc/X11/default-display-manager are updated accordingly.

      Unfortunately this does not work for lightdm as this one uses some other method(s) to do the work.



      Hope someone else can shed some light on this and knows a convenient way to configure the display-manager non-interactively.






      18.04 lightdm gdm display-manager




      18.04 lightdm gdm display-manager






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 2 days ago









      ThomasThomas

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