I have three monitors, three workspaces, and three mouses & keyboards, and only 1 Linux machine.
Can I attribute each monitor and mouse and keyboard to a specific workspace?

I have three monitors, three workspaces, and three mouses & keyboards, and only 1 Linux machine.
Can I attribute each monitor and mouse and keyboard to a specific workspace?

This is called a "multiseat X" configuration.
There's a page on Ubuntu Wiki about it: https://help.ubuntu.com/community/MultiseatX
Other links: