Hi Borin, your system has an invalid hostname:
newaliases: fatal: myorigin parameter setting must not contain multiple
values: ,amkcambodia.com
Postfix is refusing to use it. There are a few reasons this may happen..
but most likely /etc/hostname or /etc/mailname just have type-o's in
them. Edit those files, fix the hostname, run 'sudo hostname `cat
/etc/hostname`' afterwards, and then 'dpkg-reconfigure postfix'.
Closing as Invalid.
** Changed in: postfix (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/845388
Title:
package postfix 2.8.2-1ubuntu2.1 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 75
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