Ubuntu – Gnome 3.14: Is possible to disable the lock screen

( please only try the following steps if you know how to use the terminal! )

First I would have to know if even your login-screen is old as well?

If so, maybe this will help you.

you still see the old lock/login-screen because you are still using the Ubuntu default display manager lightdm, I guess..

To get the new L&F you have to set gdm as default-manager. ( be sure that gdm 3.6 is installed on your machine! )

sudo dpkg-reconfigure gdm

Now, you have to stop lightdm but this will shut down your display-manager and you will only see a terminal but that's fine.

sudo service lightdm stop

Right after lightdm has stopped, login in the prompting shell and execute following

sudo service gdm start

That's it!

Ubuntu 16.04

I have also been trying to figure out how to stop the lock screen from dimming. I can not seem to find anything associated with the screen dimming when going to the lock screen that I can edit/tweak.

I tried all the usual suggestions of

gsettings set org.gnome.desktop.screensaver idle-activation-enabled false

gsettings set org.gnome.desktop.session idle-delay 0

gsettings set org.gnome.settings-daemon.plugins.power idle-dim false

but none of them worked.

**** WORKAROUND ****

However invoking an activity once the dimming starts seems to then follow what ever settings you have enabled in the system settings > Brightness & Lock > settings.

The way you can stop it is by locking the screen then typing a few random characters into the password prompt. It will now no longer dim.

It's not a perfect solution by a long shot as the user has to invoke the lock screen manually to get it to work but it may help.