There might be a problem solving the package dependencies. I have found it by
installing the "postgres-server" and "postgres" packages at once. Reproduced
with today's STABLE. I'll try it again after we download the inofficial Beta2.

"postgres-server" requires "postgres" and "postgres-libs"
"postgres" requires "postgres-libs"

So the requirement is there twice...

Howto reproduce the error:
If you select "postgres-server" AND "postgres" in the package manager, it
returns dependency conflict => postgres-libs unavailable. Then (after clicking
on [Ignore] it selects the postgres-libs package).

Howto make it working:
If you select "postgres-server" ONLY, it retutns => "dependencies are OK" and
selects also the dependent packages: "postgres" and "postgres-libs".

logs will follow...