Re: no nvidia module found
In order to update your xserver-xorg-wacom, you would have updated nearly all of the xserver-xorg packages as dependencies. That breaks the Nvidia driver that comes with MEPIS. It's one of the reasons that package is in the testing CR instead of in Main.
If you have a wired data connection, the easiest way to fix this will be with sgfxi.
Booting from the hard drive, you should be able to get to a Console terminal by pressing Ctl+Alt+F1
log in as root, then run these commands
Follow the prompts. It should install the latest nvidia driver.