yeah - got the same problem with the ip 1800. A friend of mine is thrilled with PCLOS (LXDE) which I set up for him to test on a notebook but I cannot get his printer up and running for him so he will probably abandon us
. I don't know if this was an in-between model or only made in Europe/Asia but Canon's official site does not provide drivers (Linux). There was a driver on the Australia site (unofficial) for a while but seems to have disappeared.... There is an ip 1700/1900 but no 1800. I thought I might just try the next nearest to the 1800 and see what happens.
Have you tried any close models?