Public bug reported:

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)

** Affects: gnutls28 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages

** Summary changed:

- libgnutls30 version in Ubuntu 20.04 broke breaks pulseui client with error 
"Error performing TLS handshake: The Diffie-Hellman prime sent by the server is 
not acceptable (not long enough)."
+ libgnutls30 version in 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)."

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https://bugs.launchpad.net/bugs/1860461

Title:
  libgnutls30 version in 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)."

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