As discussed in chapter 7 module 1. While cloning to stable linux distribution.
Terminal stucks at "Cloning into linux_stable..."
If you are running git clone on a vm, check if the vm has enough space. Check dmesg and see if you see any error messages. Take a look at this thread from this forum for help:
There was less space in the VM and also there were some connectivity issues, the problem got solved, today I have completed the course. Thank you.