Installing ODK Central on Ubuntu

1. What is the issue? Please be detailed.
I am trying to install ODK Central on Ubuntu server. When i run the command 'sudo git clone', i get an error "fatal: unable to access '': failed to connect to port 443 after 129937 ms". What could be the problem? Please assist

2. What steps can we take to reproduce this issue?
Not sure

3. What have you tried to fix the issue?
I tried to check which ports are open on ubuntu server but it looks like i am using a wrong command. Please share the commands to check the ports available and open.

4. Upload any forms or screenshots you can share publicly below.

Your Ubuntu server cannot connect to Github because you have no Internet (or it's very slow or it's been blocked). Ask your Internet provider for help.

Thank you. I will check with the internet service provider.

Just for clarity, Am i using the correct command "git clone" for when installing it on Ubuntu server, or i should use "git clone -c core.autocrlf=false"