Trying to check a remote branch out with git, and having it deny the existence of the remote branch? Or report something like:
$ git checkout --track -b 7.1 upstream/7.1 fatal: git checkout: updating paths is incompatible with switching branches. Did you intend to checkout 'upstream/7.1' which can not be resolved as commit?
You need to fetch the remote. Not just the branch you want;
git fetch upstream 7.1 won't work, you need
git fetch upstream to fetch branch refs etc. See http://stackoverflow.com/questions/945654/git-checkout-on-a-remote-branch-does-not-work and http://www.btaz.com/scm/git/fatal-git-checkout-updating-paths-is-incompatible-with-switching-branches/
There's also a handy tool I didn't know about despite using git for a fair while now:
$ git remote show upstream * remote upstream Fetch URL: git://github.com/jbossas/jboss-as.git Push URL: git://github.com/jbossas/jboss-as.git HEAD branch: master Remote branches: 7.1 new (next fetch will store in remotes/upstream) master new (next fetch will store in remotes/upstream) Local ref configured for 'git push': master pushes to master (up to date)