My printer canonMP550 doesn't work with i7 x86 64bit under Ubuntu 11.10 with cups+Gutenprint2.5.7. What I found, is: in gutenprint it is translated into ip4000 only, but it belongs to the group ip4700, which is translated into ip4300 (parameter).
I tried to correct, read only, what to do?
Next is gutenprint uses cups 1.2, but installed is cups 1.5 , so instead system/library/
color sync/ ..... it is
So this seem to be real bugs, but Ii am new and need help to correct this staff!