Comment 9 for bug 681708

Unfortunately, there was no nmcli on 10.04, so there is no way to compare how it worked.

I'd expect you would have more error messages than that, especially if the issue is with DBUS permissions like I expect. Could you attach a file which has the whole output as you get it from cron (usually it comes as an email, you can check with 'mail', or 'cat /var/spool/mail/$USER' commands).

Otherwise, are you trying to change a connection that was marked as a system connection? If it's the case, you might want to uncheck the "Available to all users" checkbox in the connection configuration and try again.