"Activated service 'org.freedesktop.ModemManager1' failed: Cannot launch daemon, file not found or permissions invalid" showed in syslog in Ubuntu 14.04

[Ｖ字龍(Vdragon)]

as bug summary
`````
dbus[pid]: [system] Activating service name='org.freedesktop.ModemManager1' (using servicehelper)
dbus[pid]: [system] Activated service 'org.freedesktop.ModemManager1' failed: Cannot launch daemon, file not found or permissions invalid
`````
appears every 2 minutes

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: modemmanager 1.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-29.53-lowlatency 3.13.11.2
Uname: Linux 3.13.0-29-lowlatency i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
CurrentDesktop: KDE
Date: Mon Jun 16 01:50:38 2014
InstallationDate: Installed on 2013-03-08 (463 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
SourcePackage: modemmanager
UpgradeStatus: Upgraded to trusty on 2014-04-19 (57 days ago)
upstart.modemmanager.override: manual

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Kevin O'Gorman (kogorman-pacbell)]

This is probably obvious, but if like me you don't have or want a modem, you can remove the package that's generating these messages:
apt-get remove modemmanager

[Ｖ字龍(Vdragon) (vdragon)]

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.