Operating system Ubuntu Linux 20.04.3
Webmin version 1.984 Usermin version 1.834
Virtualmin version 6.17-3 Authentic theme version 19.84.7
Similar to Error - Perl execution failed; Undefined subroutine &firewall6::get_module_acl called at ./firewall6-lib.pl line 21. [#55970] | Virtualmin,
when you visit, Webmin > Networking > Linux IPv6 Firewall and click on the configuration cog at top left, you get this:
`Require firewall6/firewall6-lib.pl failed : Undefined subroutine &firewall6::get_module_acl called at /usr/share/webmin/firewall6/firewall6-lib.pl line 21.
keep in mind I do not have IPv6 enabled on my droplet.