MySQL db connectivity issue

I’ve been able to successfully build the Legacy UI module, but I’ve not been able to locate the proper directory to copy it to in the build of openmrs-core. I looked at the comments section for solution and started following steps to extract 2.0.x branch to rebuild. i see the following error when i give this command to fetch 2.0.x branch. Does 2.0.x repository still exists or the repository name has changed? Please let me know how to proceed :

git fetch upstream 2.0.x:2.0.x - "suma$ git fetch upstream 2.0.x:2.0.x fatal: ‘upstream’ does not appear to be a git repository fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists. "