package postgresql-common (not installed) failed to install/upgrade: il sottoprocesso nuovo pacchetto postgresql-common script pre-installation ha restituito lo stato di errore 2

Thank you for taking the time to file a bug report.

Based on the logs attached to the bug, it seems to me that this is a local configuration issue. Do you have any other instance of Postgresql running? Based on the log below:

Preparativi per estrarre .../24-postgresql-common_216_all.deb...
Viene aggiunto "deviazione di /usr/bin/pg_config in /usr/bin/pg_config.libpq-dev da postgresql-common"
dpkg-divert: errore: la rinomina comprende il sovrascrivere "/usr/bin/pg_config.libpq-dev" con
   il file "/usr/bin/pg_config", non consentito
dpkg: errore nell'elaborare l'archivio /tmp/apt-dpkg-install-JGVG7f/24-postgresql-common_216_all.deb (--unpack):
 il sottoprocesso nuovo pacchetto postgresql-common script pre-installation ha restituito lo stato di errore 2

dpkg was unable to manipulate "/usr/bin/pg_config" properly, which can mean that you already have another version of the file installed.

Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.

However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".

For local configuration issues, you can find assistance here:
http://www.ubuntu.com/support/community

[Expired for postgresql-common (Ubuntu) because there has been no activity for 60 days.]