Unity doesn't restart sometimes with install/uninstall

All are in the tittle, when I run the commands 'quickly install my_project' and 'quickly uninstall my_project', sometimes my interface doesn't restart and I must restart my computer to resolve the problem.

Possible workaround, I saw the code and found the line "os.system('sudo -u %s unity --replace &' % os.environ.get('SUDO_USER', 'root')) for restart unity/ I try with this command: "os.system('unity &> /dev/null & disown')" and I detect no problems, Unity restarts normally..