I found that this message generated because I manually disabled the modemmanager Upstart service, which isn't a bug since NetworkManager needs it anyway.
The motivation of disabling this service is that it's starts no matter if there's modem connected and it abnormally generates redundant "restart" messages during system shutdown, if anyone have concern of this issue please file a new bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1330239 Title: "Activated service 'org.freedesktop.ModemManager1' failed: Cannot launch daemon, file not found or permissions invalid" showed in syslog in Ubuntu 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1330239/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs