PostgreSQL 9.2 is not included standard with 12.10, but my work requires features unavailable in past versions. I had previously followed these instructions to install PostgreSQL 9.2 and there were no problems directly with this install.
I'm now trying to upgrade to 13.04 from 12.10, but encounter an "unresolvable problem" while setting new software channels.
I run update-manager. Everything is up to date, but get the message that 13.04 is available now and I click upgrade. I don't think it's relevant, but before I encounter the major error, I'm told
Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager.
This does not impede the install, so I close it and continue. Fetching completes and it begins setting new software channels. I then encounter the "unresolvable problem":
What do I need to do to proceed with my upgrade to 13.04?
I uninstalled PostgreSQL 9.2, upgraded, and added PostgreSQL 9.2 (from an older distro package) as described here. This is working fine, I'm running 13.04 and have PostgreSQL 9.2, but this workaround is not possible for our production server. Uninstalling PostgreSQL on the server risks losing our database. I need a solution that does not require removing PostgreSQL, see this question.