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 Touch seeded packages, which is subscribed to gnome-online-accounts in 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)." Status in evolution package in Ubuntu: Confirmed Status in gnome-online-accounts package in Ubuntu: Confirmed Status in gnutls28 package in Ubuntu: Incomplete Bug description: After upgrade to 20.04 package libgnutls30 broke pulseUI VPN client with the following error: "Error performing TLS handshake: The Diffie-Hellman prime sent by the server is not acceptable (not long enough)." I had to revert the package to the 19.10 version (3.6.9-5ubuntu1) and to install 19.10 dependency libhogweed4 3.4.1-1 to fix it. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: libgnutls30 3.6.9-5ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3 Uname: Linux 5.4.0-9-generic x86_64 ApportVersion: 2.20.11-0ubuntu15 Architecture: amd64 Date: Tue Jan 21 17:48:39 2020 InstallationDate: Installed on 2017-06-21 (943 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) SourcePackage: gnutls28 UpgradeStatus: Upgraded to focal on 2020-01-10 (10 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/1860461/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
