Just a comment: 'exit' is not the only way to terminate a shell script prematurely; if any of the scripts call 'set -e' and then any of the commands executed after that fails (i.e. returns a non-zero exit code) the script will terminate.
I would suggest the same debugging technique: adding exec >> /tmp/dhcp.debug 2>&1 set -x somewhere near the top of the first dhclient exit hook, and then looking at the execution log in /tmp/dhcp.debug to see whether the dbus-send command from /etc/dhcp3/dhclient-exit-hooks.d/zzzz_dhcdbd got executed or not. -- NetworkManager wrongly releases DHCP IP https://bugs.launchpad.net/bugs/105251 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs