I am using the latest Ubuntu 11.04. My computer is Lenovo Thinkcenter M series. I am now using dual monitors. I am wondering whether I could use three monitors on my system?
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I was trying to do the same thing, and went down the external USB video card route and never got it to work. I've ended up using a cheap Nettop machine and the keyboard/mouse sharing solution Synergy. I have the feel of one machine, but it's distributed (I use the nettop as an auxilary/utility machine for browsing, printing labels, etc.... The Acer Revo AR1600 can be had for about $100US on ebay and is a nice little machine that takes up very little space.
You could buy something like Matrox's TripleHead2Go.
It's essentially a box that you plug all your screens into and then plug that into your graphics card. The box appears as one monitor so negates having to fight with drivers and whatnot.
The downside is Ubuntu doesn't know that it's a dual/tri-screen setup so won't know how to maximise things properly (they'll split over the two screens) and dialogue placement might be over the two screens.
The other downside is it's expensive. Really expensive... As expensive as a graphics card that can support 3+ monitors on a desktop.