I found that just applying the linked patch to the deb-src package does not fix the issue. Something else that's relevant must have changed between the Ubuntu package state and that commit in the proftpd github, or one of the other Ubuntu patches interferes.
I found that just applying the linked patch to the deb-src package does not fix the issue. Something else that's relevant must have changed between the Ubuntu package state and that commit in the proftpd github, or one of the other Ubuntu patches interferes.