Does not detect hotplugged USB storage device (Ubuntu upgraded 10.04->12.04)

[madnux]

I have Ubuntu 10.04 LTS on my computer, unexpectedly can't automount USB pendrives anymore, and in nautillus doesn't show the devices.

Only with sudo fdisk -l, I can see that ubuntu can recognize it, seeing /dev/sdbx in the terminal.
http://pastebin.com/c8S5nQ87

I upgraded from 10.04 to 12.04 two days ago and still can't automount USB pendrives anymore. Only manually.

Checking with dconf-editor and all is fine.

Other info using: tail -f /var/log/syslog
http://pastebin.com/utGF4LA5

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gvfs 1.12.1-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic i686
ApportVersion: 2.0.1-0ubuntu14
Architecture: i386
Date: Tue Oct 30 19:22:55 2012
GvfsMonitorLog: Monitoring events. Press Ctrl+C to quit.
HotplugNewDevices: /dev/sdb /dev/sdb1
HotplugNewMounts:

InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 PATH=(custom, no user)
 LANG=es_MX.UTF-8
 SHELL=/bin/bash
SourcePackage: gvfs
Symptom: storage
Title: Does not detect hotplugged storage device
UpgradeStatus: Upgraded to precise on 2012-10-30 (0 days ago)