Problems with git clone

I have a problem cloning a repo when I use :

git clone https://github.com/burbanox/responsive-design.git

throw me an error :

fatal: unable to access 'https://github.com/burbanox/responsive-design.git/': gnutls_handshake() failed: Error in the pull function.

so when I use :

git clone git@github.com:burbanox/responsive-design.git

stays loading forever :

Cloning into 'responsive-design'...
remote: Enumerating objects: 115, done.
remote: Counting objects:   6% (7/115)

I use ubuntu 20.04 LTS

I change to Openssl but not works

At a glance those sound like issues with the network, where your system can initially establish a connection but then it breaks or gets slowed down extremely. It’s hard to say what might cause that, could be anything from a misconfigured firewall or antivirus on your side to a problem with your provider or their backbone connections.

Troubleshooting connectivity problems - GitHub Docs might provide some hints on how to analyze this further.