Comment 10 for bug 996916

I had this trying to upgrade from 14.04 to 14.10, although I didn't get any indication of the package causing the problem - see #1406740.

I tried commenting out the postgresql line from removal_blacklist.cfg, like cfi mentioned, but similarly it didn't fix the problem for me.

Once I removed all the postgresql packages (server and client, plus the postgis stuff and as a knock-on some mapnik packages) the upgrade ran through successfully.

Sadly I didn't make a note of the packages I removed, but can probably work out a rough list of what they were if that's useful.