Solution : DBus error org.gtk.Private.RemoteVolumeMonitor.Failed:An operation is already pending

If you get Unable to mount usb drives and getting DBus error org.gtk.Private.RemoteVolumeMonitor.Failed:An operation is already pending like below

Solution is Do as root

[root@sys ~]# cd /media/

[root@sys media]# ls -a

.  ..  04376381-139c-4953-bd94-8d9ae3a23790  .hal-mtab-lock  NAGESH J

remove .hal-mtab-lock

[root@sys media]# rm -rf .hal-mtab-lock 

[root@sys media]#