On 10/6/24 15:21, Simon McVittie wrote:
libgtk-4-1 Recommends cpdb-backend-cups, which Depends on libcupsfilters2, which Depends on libcupsfilters2-common, which Breaks cups-filters (<< 2.0~), but cups-filters (>= 2.0~) is not yet available in testing/unstable. This looks like a half-complete transition from CUPS filters 1.x to 2.x?
This IS a half-complete transition. At Ubuntu, once passing to libcupsfilters2 and libppd2 I have also updated cups-filters to 2.x. For a correct transition, you have to replace the source package cups-filters (1.x) and all its binaries by the source packages libcupsfilters, libppd, cups-filters, and cups-browsed, all 2.x and all their binaries.
See the Ubuntu packages for how I did the transition. Till