Thanks for the link Kai-Uwe, although I'm not sure what suggests it is a vendor driver issue from there (but I'm far from an expert).
That link does confirm the colour issues in this bug on the affected OS.
Comment #10 here shows the testing by Gyuris that with the same official driver the printer works perfectly with Cups under 10.04 - 11.10, versions 1.4.3 - 1.5.0, but following a change in 12.04 / Cups 1.5.3 it prints very strange colours.
FWIW I'm running on i386 - officially supported OS by Xerox.
Thanks for the link Kai-Uwe, although I'm not sure what suggests it is a vendor driver issue from there (but I'm far from an expert).
That link does confirm the colour issues in this bug on the affected OS.
Comment #10 here shows the testing by Gyuris that with the same official driver the printer works perfectly with Cups under 10.04 - 11.10, versions 1.4.3 - 1.5.0, but following a change in 12.04 / Cups 1.5.3 it prints very strange colours.
FWIW I'm running on i386 - officially supported OS by Xerox.