This is not a package bug, but a local configuration issue. From the
provided dpkg log:
newaliases: warning: valid_hostname: numeric hostname: 04
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter
value: 04
dpkg: error processing package postfix (--configure):
subprocess installed post-installation script returned error exit status 75
All numeric host names aren't valid. If you set a valid hostname on the
system, postfix will configure correctly.
** Changed in: postfix (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1635759
Title:
package postfix 3.1.0-3 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 75
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