I have been successfully upgrading with each minor release and each major release since 3.5.0 with no problems. I do know the difference between a minor and major upgrade.
When trying to move from 3.8.3 to the current release 3.9.1
git branch -a
doesn't show a branch for
MOODLE_39_STABLE (it only shows MOODLE_38_STABLE as the current branch)
If I use the git command anyway with
git branch --track MOODLE_39_STABLE origin/MOODLE_39_STABLE
I get the error message
error: the requested upstream branch 'origin/MOODLE_39_STABLE' does not exist
Has something changed? I've doubled checked all the current release docs and nothing new is reflected from this standard process.