Your hostname is not valid according to postfix.
Relevant error:
Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 192.168.10.101
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter
value: 192.168.10.101
dpkg: viga paki postfix töötlemisel (--configure):
alamprotsess installed post-installation script tagastas lõpetamisel veakoodi
75
** Changed in: postfix (Ubuntu)
Status: New => Won't Fix
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package postfix 2.6.5-3 failed to install/upgrade: alamprotsess installed
post-installation script tagastas lõpetamisel veakoodi 75
https://bugs.launchpad.net/bugs/555521
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