Thanks for filing this bug in Ubuntu. Unfortunately this report lacks enough information to diagnose the issue.
For example, I just installed postfix on a fresh bionic system, and all looks fine: root@bionic-postfix:~# apt-cache policy postfix postfix: Installed: 3.3.0-1ubuntu0.1 Candidate: 3.3.0-1ubuntu0.1 Version table: *** 3.3.0-1ubuntu0.1 500 500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 3.3.0-1 500 500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages root@bionic-postfix:~# l /etc/postfix/postfix-files -rw-r--r-- 1 root root 10K Aug 16 18:33 /etc/postfix/postfix-files root@bionic-postfix:~# postfix check root@bionic-postfix:~# echo $? 0 What is your /etc/postfix/postfix-files entry, if not a file? Could you perhaps attach more logs to this report, using "sudo apport- collect -p postfix 1791403"? ** Changed in: postfix (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to postfix in Ubuntu. https://bugs.launchpad.net/bugs/1791403 Title: postfix 3.3.0 unable to create missing queue directories To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1791403/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs