Common Issues

No GUI!? Screwing up with Unity/Gnome/MATE etc.? Can’t log in!?
Well, we have a solution for you!

# apt-get install lightdm-gtk-greeter
# apt-get install lightdm-kde-greeter

Now, go to:
# vim /etc/lightdm/lightdm.conf

& edit you lightdm.conf config file. It should look something like this:

[SeatDefaults]

allow-guest=false
greeter-session=lightdm-gtk-greeter
user-session=ubuntu

Also, it could be a problem of you GUI or Tiling manager as well. So, just to ensure that, reinstall you environment. For unity users, you could do something like this:

# apt-get install --reinstall ubuntu-desktop
# apt-get install unity

For i3/awesome/gnome/MATE users, you could rebuild the respective interface.

Another possibility of this would be the other lightdm conf file. To efface the troublesome configuration file, try this:

sudo vim /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

[SeatDefaults]
user-session=ubuntu

A rare possibility can be your display driver. If you have tried any beta version of nvidia-driver or CUDA drivers, this may be the reason. Run

 # apt-get install nvidia-current

to make sure that your graphics driver isn’t the issue.

P.S Do not forget to restart your system:
# shutdown -r now

Also check this:

https://github.com/chahatdeep/dotfiles/issues/1

Cheers!

*Arch users, use ‘pacman -S’ instead of ‘apt-get’.
Source: http://askubuntu.com/questions/542012/ubuntu-14-10-booting-problems-no-login-screen

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