Thanks for your info.

Booted up with USB plugged in.

light on USB not on

Some minutes later, a screen message flashed on about USB, so quick I
couldn't read it.

jerry@ThinkPad-T40:~$ sudo lsusb
[sudo] password for jerry: 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 046d:c52f Logitech, Inc. Wireless Mouse M305
Bus 001 Device 119: ID 0781:5530 SanDisk Corp. Cruzer
jerry@ThinkPad-T40:~$ sudo dmesg | tail -30
[  400.712064] usb 1-4: new high-speed USB device number 108 using ehci_hcd
[  400.780329] hub 1-0:1.0: unable to enumerate USB device on port 4
[  400.968346] hub 1-0:1.0: unable to enumerate USB device on port 4
[  401.156317] hub 1-0:1.0: unable to enumerate USB device on port 4
[  401.344297] hub 1-0:1.0: unable to enumerate USB device on port 4
[  401.532402] hub 1-0:1.0: unable to enumerate USB device on port 4
[  401.720383] hub 1-0:1.0: unable to enumerate USB device on port 4
[  401.908359] hub 1-0:1.0: unable to enumerate USB device on port 4
[  402.096368] hub 1-0:1.0: unable to enumerate USB device on port 4
[  402.284319] hub 1-0:1.0: unable to enumerate USB device on port 4
[  402.472431] hub 1-0:1.0: unable to enumerate USB device on port 4
[  402.660411] hub 1-0:1.0: unable to enumerate USB device on port 4
[  402.904077] usb 1-4: new high-speed USB device number 119 using ehci_hcd
[  403.326860] Initializing USB Mass Storage driver...
[  403.332185] scsi2 : usb-storage 1-4:1.0
[  403.332354] usbcore: registered new interface driver usb-storage
[  403.332358] USB Mass Storage support registered.
[  404.729559] scsi 2:0:0:0: Direct-Access     SanDisk  Cruzer           1100 
PQ: 0 ANSI: 0 CCS

At that point, pcmanfm was NOT showing the USB device.

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https://bugs.launchpad.net/bugs/952617

Title:
  Lubuntu 12.04 unable to mount USB keys

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