This is due to an invalid hostname:
Setting up postfix (2.9.1-4) ...
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: 1110011221
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad
parameter value: 1110011221
dpkg: error processing postfix (--configure):
subprocess installed post-installation script returned error exit status 75
** Changed in: postfix (Ubuntu)
Status: New => Won't Fix
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Server Team, which is subscribed to postfix in Ubuntu.
https://bugs.launchpad.net/bugs/1006196
Title:
package postfix 2.9.1-4 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 75
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