As of http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627770, foomatic-db-compressed-ppds Conflicts: foomatic-db-engine, but printer-driver-foo2zjs Recommends: it. The effect of this is to cause our daily image builds to fail, as they're trying to co-install two packages which aren't co-installable, hence the Critical priority as our daily builds must stay working at all times.
The change in foomatic-db-compressed-ppds sounds quite deliberate from the above bug report, so I'm filing this on foo2zjs. The package description says "The foomatic-db-engine package is recommended to simplify configuring this printer driver", but as far as I can tell it's only used for the getweb script when called with the 'ppd' argument, which is undocumented and only used by 'make oldppd'. If I'm right, isn't this sufficiently esoteric that it could be lowered to Suggests or dropped altogether?
This bug was fixed in the package foo2zjs - 20130306dfsg0- 1ubuntu1
--------------- 1ubuntu1) raring; urgency=low
foo2zjs (20130306dfsg0-
* Removed "Recommends: foomatic- db-engine" (LP: #1152831).
-- Till Kamppeter <email address hidden> Sat, 9 Mar 2013 08:54:07 +0100