[Bug 1860461] Re: 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)."

[Steven Jay Cohen]

Thank you for the testing link.

https://www.ssllabs.com/ssltest/analyze.html?d=shibboleth.nyu.edu&hideResults=on

This server supports weak Diffie-Hellman (DH) key exchange parameters.
This server does not support Forward Secrecy with the reference browsers.
This server supports TLS 1.0 and TLS 1.1.

So, you are saying that unless the University upgrades on their end, I
cannot connect from 20.04, correct?

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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:
  Confirmed

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)

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