Comment 4 for bug 207798

I'm rather sure this is not a valid bug-report. The driver is a third party one, ubuntu unfortunately cannot take care of every possible dependency of apps not provided by ubuntu (and like in this case, non free ones).

glib1.2 as well as gtk+1.2 are deprecated for a few years now, there is no longer any upstream-support for these libs, so as a consequence they were removed from hardy because fixing possible security issues and other oddities in combination with other apps would require too much manpower needed for other applications which are much more important nowadays.

I did not try it yet, but I'm rather sure you can install the gutsy-packages in hardy to make the driver work (or you can recompile them based upon the gutsy-source-packages for hardy).
The best solution would be of course, if canon would provide updated drivers, but I'm not sure how likely something like this is.