error: cannot lock ref 'refs/remotes/origin/master': unable to resolve reference 'refs/remotes/origin/master': reference broken code example

Example 1: git unable to update local ref

git gc --prune=now
git remote prune origin
rm .git/refs/remotes/origin/master
git fetch
git pull origin master

Example 2: git error: cannot lock ref 'refs/remotes/origin/master': unable to resolve reference 'refs/remotes/origin/master': reference broken

rm .git/refs/remotes/origin/master
git fetch