At the tail end of upgrading Webmin and Usermin to the latest version, I received the following error message.
Require postfix/postfix-lib.pl failed :
Undefined subroutine &postfix::compare_version_numbers called at /usr/libexec/webmin/postfix/postfix-lib.pl line 37.
Webmin: 1.840-1 / Usermin: 1.710-1
Files:
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Comments
Submitted by JamieCameron on Sun, 05/14/2017 - 16:13 Comment #1
Looks like this can happen if during the upgrade there is a mix of old and new Webmin code running. It's pretty harmless though, and won't happen in future upgrades.