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https://bugs.launchpad.net/bugs/872024
Title:
package postfix 2.8.2-1ubuntu2.1 failed to install/upgrade: subprocess
installed post-installation script returned
This is not a package bug, but the package correctly responding to a bad
configuration in your system:
Running newaliases
newaliases: warning: valid_hostname: invalid character 32(decimal): PARENTS PC
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad
parameter value: