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Yesterday i install gdm and set it default display manager then l notice ubuntu is running but there is several lines appear on desktop when i want to shutdown system after i powered off system and start Grub Menu appear and normal boot system but nothing is appear and black screen is regularly appear even after several restart.

Farooq
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  • The questions which this is marked as a duplicate of are:
    1. A very, very lengthy page about boot issues of all sorts, mainly grub problems
    2. A page on how to switch back to lightdm if you've made gdm your default display manager.

    Neither of them answer the question, which is "why is GDM showing a black screen instead of the usual login screen". Also the only answer below is also just info on how to switch back.

     – Damon Smith Oct 04 '15 at 22:14

1 Answers1

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Try this:

on that black screen click Ctrl+Alt+f1

enter your user-name

password:your password

$ sudo su

enter your password

run

# dpkg-reconfigure gdm

or

# dpkg-reconfigure lightdm

and choose lightdm

reboot

(sorry for my bad English)

Danatela
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mouh
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    can you try to use proper formatting please? I have no idea what you're recommending. – Seth Mar 13 '14 at 00:32
  • CTRL+ALT+Fx just yields a blank black screen with a blinking cursor in the top-left, no login prompt, no response. – Coder Guy Nov 05 '15 at 06:21