As a workaround, can you try lowering the profile from MEDIUM [1] to LEGACY:
sudo mkdir /etc/gnutls cat << EOF | sudo tee -a /etc/gnutls/config [overrides] default-priority-string = NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-DTLS1.2:%PROFILE_LEGACY EOF 1: https://git.launchpad.net/ubuntu/+source/gnutls28/tree/debian/rules#n38 ** Changed in: gnutls28 (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1860461 Title: libgnutls30 3.6.11.1-2ubuntu2 (Ubuntu 20.04) breaks pulseui client with error "Error performing TLS handshake: The Diffie-Hellman prime sent by the server is not acceptable (not long enough)." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/1860461/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
