Error message from log:
After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.
Running newaliases
newaliases: fatal: myorigin parameter setting must not contain multiple
values: pegaso,homepc.it
dpkg: errore nell'elaborare postfix (--configure):
il sottoprocesso vecchio
It appears that your hostname (pegaso,homepc.it) is not correctly
specified as it contains a comma.
This is stored in /etc/mailname for postfix and is generated on install
of postfix based on the hostname of your computer (/etc/hostname) but
can be overridden manually by changing /etc/mailname.
** Attachment added: AptOrdering.txt
https://bugs.launchpad.net/bugs/659305/+attachment/1688436/+files/AptOrdering.txt
** Attachment added: Dependencies.txt
https://bugs.launchpad.net/bugs/659305/+attachment/1688437/+files/Dependencies.txt
** Attachment added: Df.txt