Messaggio completo:
error: Ref refs/remotes/origin/user is at 3636498c2ea7735fdcedc9af5ab3c8689e6abe77 but expected a21359c6cc2097c85775cde6a40105f4bd7100ec
From github.com:{github project url}
! a21359c..6273ffc user -> origin/user (unable to update local ref)
git push --force
. Prova a correregit pull --force
.