Thank you for taking the time to file a bug report. I'd like to ask which Ubuntu release you are using. I see you are installing postfix version 3.5.6-1 but this version is available in Ubuntu Groovy, Hirsute and Impish (development release). This info is important for us to try to reproduce the bug and make it actionable. Moreover, if you could share any local change you have made to /etc/postfix/main.cf that'd be great.
Since there is not enough information in your report to begin triage or to differentiate between a local configuration problem and a bug in Ubuntu, I am marking this bug as "Incomplete". We would be grateful if you would: provide a more complete description of the problem, explain why you believe this is a bug in Ubuntu rather than a problem specific to your system, and then change the bug status back to "New". For local configuration issues, you can find assistance here: http://www.ubuntu.com/support/community ** Changed in: postfix (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1931801 Title: Apt install postfix fails with bad demiliter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1931801/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs