Installing/upgrade trac w/ postgresql fails: Password fail

Hi, when I try to install/update my trac instances, I get this error:

Downloading http://ftp.edgewall.com/pub/trac/Trac-0.12.1.tar.gz (2.07 MB) ..
     Received 1024 bytes (0 %)
     Received 212 kB (10 %)
     Received 424 kB (20 %)
     Received 636 kB (30 %)
     Received 848 kB (40 %)
     Received 1.04 MB (50 %)
     Received 1.24 MB (60 %)
     Received 1.45 MB (70 %)
     Received 1.66 MB (80 %)
     Received 1.86 MB (90 %)
     Received 2.07 MB (100 %)
.. download complete.
Found http://www.saddi.com:80/software/flup/dist/flup-1.0.tar.gz in cache ..
 
Python module psycopg is required ..
Installing package python-psycopg ..
Installing package(s) with command apt-get -y --force-yes -f install python-psycopg ..
Reading package lists...
Building dependency tree...
Reading state information...
Package python-psycopg is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package python-psycopg has no installation candidate
.. install failed!
.. automatic Python module installation failed
Installing package python-psycopg2 ..
Installing package(s) with command apt-get -y --force-yes -f install python-psycopg2 ..
Reading package lists...
Building dependency tree...
Reading state information...
python-psycopg2 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.
.. install complete.
.. done
Now installing Trac version 0.12.1 ..
Database connection failed : DBI connect failed : FATAL: password authentication failed for user "software-consultant.net" 2.
.. failed! See the error message above for the reason why.

This happens with both the current 0.12.2 as well as the previous 0.12.1 version.

I did not manually fiddle with the passwords, nor do I have any problems with the installed application. Any idea what could be wrong or how I could fix it? Kind regards,

Christian