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I want to make use of an old laptop by extending my the desktop from my main PC onto the monitor of this other, old laptop over a LAN connection.

I've looked into Xdmx/dmx, but the project seems to have been dead for a while.

Are there any other alternatives or will I have to cobble my own script together?

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Have you tried Xdmx? Arch has it in their repositories and people have it working as late as a year ago. – new123456 May 14 '12 at 20:19
Like i said, I've looked into it but I use Ubuntu and the package is broken and the source repo from the website is empty :/ – jackweirdy May 14 '12 at 23:44
Did you report it as a bug? – Daniel Andersson May 18 '12 at 12:19
Yaha, although it seems to be fixed in 12.04 – jackweirdy May 27 '12 at 18:40
up vote 2 down vote accepted

A hackish solution would be to extend your desktop to dual X displays on your main machine, with DISPLAY=:0 being your main screen and DISPLAY=:1 being to the right. Run x11vnc to share display 1 and then run a barebones client on the laptop with a VNC viewer that connects to display 1 over Ethernet and projects it full screen.

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