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I've been experimenting with various Desktop Environments, including LXDE, XFCE, KDE.

I'm returning to Unity, and I would like my login screen back to the default for 12.04. I think that it changed when I tried KDE, probably because of an answer I gave to a prompt that I didn't understand.

Any ideas?

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does this one answer your question?… – RobotHumans May 1 '12 at 10:28
If it does, it certainly could be more explicit. I'm confused after reading it. But I'm not at all sure if it is answering the same question. – Eric Wilson May 1 '12 at 10:57
Referring to the boot splash screen is a duplicate to this one and referring to revert back to lightdm login screen is a duplicate of this question – Anwar Shah Jul 31 '12 at 8:25
up vote 17 down vote accepted

For getting back the default boot loading, use the following :

sudo update-alternatives --config default.plymouth , then choose whichever bootscreen you prefer, for default /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth, afterwards run this command sudo update-initramfs -u

For the login screen, run this command : sudo dpkg-reconfigure lightdm

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You need as well to do the same for default.plymouth.grub sudo update-alternatives --config default.plymouth.grub – Antonio Jun 4 at 1:38

Thank you for the last part of last answer:

Similar issue on 14.04 where "gdm" is again broken/no longer supported?

I was in a bind after reboot *I could no longer login to Ubuntu: NO login screen -- only a background and mouse (nothing else). Then recalled I had selected "gdm" as default for lightdm reconfiguration once (as part of a successful package installation).

Login from a terminal (Ctrl+Alt+F1) and then enter:

sudo dpkg-reconfigure lightdm

Then selecting default "lightdm" from the TTY menu choice. I was able to restore a working login screen (and it still worked across reboot).

Basically after 12.04, never select anything but default "lightdm"... (Unless you have installed something else that you know for sure will work -- e.g. KDE)

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