Hotplug problem with Ubuntu 12.04

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http://www.linuxquestions.org – Hello everyone, I am running ubuntu 12.04 on a hp box. Until very recently, inserting a flash drive in a usb pocket or using the internal dvd drive would produce an icon on the sidebar which was clickable and also besides the icon, the drive would be mounted to the appropriate mount point. For reasons I haven't figured out, hotplugging no longer functions at all. However, if I insert a flash drive in a slot, the system is aware of the event, as indicated by a DMESG message. Using fdisk -l shows the same thing--the drive partitions are listed. Blkid shows the same thing, as does lsusb. I (HowTos)