I1104 14:08:58.146451 1937 server.cpp:419] MTP server starting...
E1104 14:08:58.163847 1937 server.cpp:440] Could not start the MTP server:org.freedesktop.DBus.Error.ServiceUnknown: The name com.canonical.UnityGreeter was not provided by any .service files
I1104 14:08:58.694383 2013 server.cpp:419] MTP server starting...
It might be that upstart is giving up on restarting the job.
From the logs:
I1104 14:08:58.146451 1937 server.cpp:419] MTP server starting... org.freedesktop .DBus.Error. ServiceUnknown: The name com.canonical. UnityGreeter was not provided by any .service files
E1104 14:08:58.163847 1937 server.cpp:440] Could not start the MTP server:
I1104 14:08:58.694383 2013 server.cpp:419] MTP server starting...
It might be that upstart is giving up on restarting the job.