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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.

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marked as duplicate by karel, Seth Mar 13 at 0:32

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1 Answer 1

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)

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1  
can you try to use proper formatting please? I have no idea what you're recommending. –  Seth Mar 13 at 0:32
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