I can also reproduce this bug in Ubuntu 20.04 LTS when running the command "sudo proftpd --configtest":
Checking syntax of configuration file 2020-07-08 18:16:34,321 <redacted hostname> proftpd[16283]: mod_dso/0.5: unable to load 'mod_vroot.c'; check to see if '/usr/lib/proftpd/mod_vroot.la' exists 2020-07-08 18:16:34,321 <redacted hostname> proftpd[16283]: fatal: LoadModule: error loading module 'mod_vroot.c': No such file or directory on line 109 of '/etc/proftpd/proftpd.conf' Package info: Package: proftpd-mod-vroot Version: 0.9.8-1build1 Priority: optional Section: universe/net Origin: Ubuntu Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com> Original-Maintainer: ProFTPD Maintainance Team <pkg-proftpd-maintain...@alioth-lists.debian.net> Bugs: https://bugs.launchpad.net/ubuntu/+filebug Installed-Size: 49.2 kB Depends: proftpd-basic (>= 1.3.4~rc2-2~), libc6 (>= 2.17), proftpd-abi-1.3.6c Breaks: proftpd-basic (<< 1.3.4~rc2-2~) Homepage: http://www.castaglia.org/proftpd/modules/mod_vroot.html Download-Size: 11.7 kB APT-Manual-Installed: yes APT-Sources: http://ports.ubuntu.com focal/universe arm64 Packages Description: ProFTPD module mod_vroot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880683 Title: unable to load mod_vroot.c To manage notifications about this bug go to: https://bugs.launchpad.net/proftpd-dfsg/+bug/1880683/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs