package postfix 2.7.0-1ubuntu0.2 failed to install/upgrade: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 75

Error from log:

Postfix configuration was not changed. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 04
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 04
dpkg : erreur de traitement de postfix (--configure) :
 le sous-processus script post-installation installé a retourné une erreur de sortie d'état 75

Thank you for taking the time to report this bug and helping to make Ubuntu better.

It looks like your system is configured with an invalid hostname and domain '04' (or at least that is how postfix has been configured).

You can set this manually in /etc/postfix/main.cf (look for the mydomain parameter) - or you could re-configure your system with a valid host and domain name.

You can then complete your upgrade by running:

   sudo dpkg-reconfigure postfix

If this resolves your issue please mark this bug as 'Invalid'

Thanks

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