I just used apt-get on ubuntu to "install"mate. But it did not seem to have any effect,
How can I get mate to be my window manager?
Did you change your session to "mate" at the login screen?
No, I didn't. I don't know how to do that.
There should be a chooser (I think it looks like a settings icon on GDM with UBuntu). Choose mate there
You'll see it on the panel on the login screen. If you press the button there a list of available desktop sessions will be available - one of which will be Mate
You need to install Ubuntu MATE meta-package with
sudo apt-get install ubuntu-mate-desktop^
(note ^
in the end of line, it marks task meta-package with all dependencies)
then logout and select MATE session on LightDM greeter:
Note: if you do not have LightDM installed, then install it with sudo apt-get install lightdm
and select it with sudo dpkg-reconfigure lightdm
Ubuntu uses GDM by default, so that won't work