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I recently dualbooted Ubuntu 13.10 on top of 12.04 and now both distros won't recognize USB devices. It recognizes that I have usb ports but nothing appears in Files when I plug in a device through USB.

EDIT: for dmesg | tail
[  854.460876] raid6: sse2x2     747 MB/s
[  854.528879] raid6: sse2x4    1087 MB/s
[  854.528890] raid6: using algorithm sse2x4 (1087 MB/s)
[  854.528898] raid6: using ssse3x2 recovery algorithm
[  854.620728] bio: create slab <bio-1> at 1
[  854.629208] Btrfs loaded
[ 1551.482251] systemd-hostnamed[13047]: Warning: nss-myhostname is not installed.     Changing the local hostname might make it unresolveable. Please install nss-myhostname!
[ 2523.892113] perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 2591.888615] psmouse serio2: Touchpad at isa0060/serio2/input0 lost sync at byte 6
[ 2591.909739] psmouse serio2: Touchpad at isa0060/serio2/input0 - driver resynced.  

For lsusb 
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 064e:d251 Suyin Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 is my webcam built into my netbook. Any device I connect doesn't get recognized by lsusb.

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What is the output of dmesg | tail? –  Braiam Feb 15 at 2:50
    
and lsusb when the USB device is plugged in? –  TrailRider Feb 15 at 2:50
    
for dmesg | tail –  user248352 Feb 15 at 2:52
    
Edit your question! –  Braiam Feb 15 at 2:53
    
I updated the question with proper formatting on the terminal output. –  user248352 Feb 15 at 3:08

1 Answer 1

I had a similar problem. It was solved by removing the USB webcam. Try unplugging your webcam. It's been months so I can't remember the exact details but it turned out that the kernel upgrade broke support for the webcam I was using. Trying to use that webcam caused problems with the entire USB subsystem.

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