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After starting the system, i've a black screen (without any screen backlight), then i have to switch to tty6 (ctrl+alt+f6), login and restart the lightdm:

sudo service lightdm restart

I'm using xfce.

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Can you please add to you r question what version of xubuntu you are using? –  MadMike Oct 26 '13 at 14:14
    
possible duplicate of How can I restart x-server from the command line? –  rds Nov 6 '13 at 19:50

1 Answer 1

up vote 1 down vote accepted

1st Way to solve your issue:

Try to reconfigure lightdm (if it doesn't solve your issue then go for Alternate way mentioned below.)

  • Open terminal(CTRL+ALT+T) and execute following command:

    sudo dpkg-reconfigre lightdm
    
  • Then chose lightdm from the list. As shown below:

lighdm

  • Restart your system:

    sudo reboot now
    

It should fix your issue.

an alternate way, which would solve your issue. Give it a try.

Installing a new display manager can fix your problem. Steps to install GDM(a display manager much like lightdm):

  • Open terminal(CTRL+ALT+T) and execute following commands:

    sudo apt-get install gdm
    sudo dpkg-reconfigure lightdm
    

    then chose gdm from the list:

gdm

    sudo reboot
  • If it's still not fixed, try removing lightdm after installing gdm:

    sudo apt-get remove --purge lightdm
    sudo reboot
    

Reply if something goes wrong..

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After purge remove lightdm, i'd to change xfce theme back to graybird, but it's works. Thanks. –  Zalazdi Oct 25 '13 at 18:12

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