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I am using Ubuntu 14.04, and I installed the MATE desktop to try it out. I did not like it, so I removed it. Now my login screen is terrible. I don't know how to restore the login screen to the original Unity login screen.

Guest123ABC
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3 Answers3

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You can try re-installing the ubuntu desktop packages and unity, then rebooting.

sudo apt-get update
sudo apt-get install --reinstall ubuntu-desktop
sudo apt-get install --reinstall unity
Kenan
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  • I tried the first two commands before I posted. I did not try the third before I posted so thanks for that thought. It did not work, but it is a good command to know. – Guest123ABC Jan 09 '15 at 22:40
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First make sure lightdm is installed: sudo apt-get install lightdm

Then reconfigure login manager: sudo dpkg-reconfigure lightdm Check if it has worked. Usually it is enough.

Also see the links: Reset to Default Unity Login

How to restore Ubuntu login screen after lubuntu install?

Community
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Muzaffar
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  • I added the lines to the lightdm.conf file. Upon rebooting my computer could only go into low graphics mode, so I only had command line login. Also when I try to reconfigure lightdm, I do not get the screen that asks for the ok option when I use the command. When I use the command literally nothing happens, so I do not know what that means or if it means anything. – Guest123ABC Jan 12 '15 at 15:20
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Test this:

Switch on your computer.

Press and hold the Shift key, which will bring up the Grub menu.

Select the line which starts with --- Advanced options.

Select the line ending with --- Recovery mode.

After a few moments, your computer should display a menu with a number of options.

Select ---- Network and ---- Drop to root shell prompt.

In a terminal run it:

sudo -i
mount -o remount,rw /
mount --all
apt-get update
apt-get install --reinstall aptitude deborphan

aptitude remove '?and(?reverse-depends(mate),?not(?reverse-depends(?exact-name(ubuntu-desktop))))'

apt-get install --reinstall ubuntu-desktop
apt-get dist-upgrade
deborphan
apt-get --purge remove $(deborphan)
deborphan --libdevel
apt-get --purge remove $(deborphan --libdevel)
deborphan --find-config
dpkg --purge $(deborphan --find-config)
apt-get autoremove
apt-get clean
reboot
kyodake
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  • About to try this next. I tried the other solutions because they were easier, but they did not work. Will get back to you. – Guest123ABC Jan 12 '15 at 15:19