The previous GPG key used to sign our Debian and Ubuntu packages was bound to expire on 4th August. I extended the lifetime of the key by three years (26th July 2020).
To prevent apt from complaining after 4th August please do this:
Code: Select all
apt-key del E158C569
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg|\
apt-key add -
More information here.