Please fix your configuration:
Setting up postfix (2.8.2-1ubuntu2.1) ...
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
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https://bugs.launchpad.net/bugs/788004
Title:
package postfix 2.8.2-1ubuntu2.1 failed to install/upgrade: subprocess
installed post-installation script returned
