apt-get Error org.freedesktop.DBus.Error.Spawn.ExecFailed: Cannot launch daemon, file not found or permissions invalid

Since a few months an error appeared in my ubuntu 12.04 everytime I ran the apt-get command. The last line of the command always showed the following error message:

It seems that one daemon couldn’t start.¬† After installing aptdaemon with the following command, the error message disappeared: