Thanks for your report.
The relevant postfix error is
---
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
could you please check your configuration in main.cf.
I'm closing this report because it is not a bug with Ubuntu or this
particular package.
** Changed in: postfix (Ubuntu)
Status: New => Invalid
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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/552126
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