*** This bug is a duplicate of bug 1872778 ***
    https://bugs.launchpad.net/bugs/1872778

As a workaround, can you try lowering the profile from MEDIUM [1] to LOW
[2]:

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_LOW
EOF


1: https://git.launchpad.net/ubuntu/+source/gnutls28/tree/debian/rules#n38
2: 
https://gnutls.org/manual/html_node/Selecting-cryptographic-key-sizes.html#Selecting-cryptographic-key-sizes

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https://bugs.launchpad.net/bugs/1866974

Title:
  The Diffie-Hellman prime sent by the server is not acceptable

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