I noticed that I could not connect to bitbucket over ssh today on Ubuntu 16.04/20.04. No pull, fetch, push, etc. I guess this is due to the update to TLS 1.3 and equivalent. I had to change the ssh_config to use ipv4 instead of ipv6.
A quick system wide fix would be to edit /etc/ssh/ssh_config and set AdressFamily to inet.
Goran
