Comment 28 for bug 1787208

Just please keep in mind, that there are also these errors in the bionic repo, that are not present in the upstream repo.
Aug 20 17:37:42 name_of_my_vpn_server openvpn[1111]: sudo: unable to send audit message
Aug 20 17:37:42 name_of_my_vpn_server openvpn[1111]: sudo: pam_open_session: System error
Aug 20 17:37:42 name_of_my_vpn_server openvpn[1111]: sudo: policy plugin failed session initialization

About disabling ipv6 ...
maybe I find the time to set up another Vserver @Hetzner with 18.04 for testing this specific issue since I dont want to stop/alter my production system for too long.