After messing with almost every setting on my home computer, it turns out there is one really really important little line that no-one really mentions:
sudo adduser boinc video
It enables Boinc to see the CUDA graphics card! Without this, it just does not work! It seems that you cant do this from the System > Administration > Users & Groups (at least I couldnt find a way!).
I am using the 180 driver from the Ubuntu repository, Boinc ver 6.4.5 from www.getdeb.com and a Nvidia 8600GT graphics card on 64-bit Ubuntu 8.10.
So ... Boinc now recognises the CUDA device ... just have to wait for Seti to start sending out CUDA workunits for Linux!
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