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I have use ubuntu over seval years, and then I altered lightdm.conf in /etc/lightdm, and now I can not access my computer it hang after crypto, and i tried from tty enter:

     sudo apt-get update
     sudo apt-get install --reinstall ubuntu-desktop

and i also tried enter:

     sudo apt-get install gdm

and can still not access my comptuer, and when I boot from usb stick I can not alter my lightdm, and when there is show a lock on the drive it seam lock, and can someone please help.

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which version of Ubuntu are you running? –  Avinash Raj May 14 at 11:32
    
Hi. It is ubuntu 14.04 LTS –  Michael May 14 at 12:12
    
See How can I restore configuration files? –  bain May 14 at 12:13
    
drop to tty and post the output of cat /etc/lightdm/lightdm.conf –  Avinash Raj May 14 at 12:15
    
Hi. It says greeter-hide-user=false greeter-show-manual-login=true allow-guest=false –  Michael May 14 at 12:35

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