This bug happens to me too. Someone said this bug not happens if devicekit-disks is installed, but happened to me just after the https://bugs.launchpad.net/ubuntu/+source/devicekit-disks/+bug/403192

To get short, same report from the bug upside plus my gvfs version:

leleobhz@luana:~$ LANG=C dpkg -l devicekit-disks gvfs ; sudo lshw -short ; stat /var/lib/apt/lists/br.archive.ubuntu.com_ubuntu_dists_karmic_main_binary-i386_Packages 
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                Version             Description
+++-===================-===================-======================================================
ii  devicekit-disks     006-0ubuntu3        abstraction for enumerating block devices
ii  gvfs                1.3.5-0ubuntu1      userspace virtual filesystem - server
H/W path               Device     Class       Description
=========================================================
                                  system      Inspiron 910
/0                                bus         BR0F29
/0/1                              memory      100KiB BIOS
/0/5                              processor   Intel(R) Atom(TM) CPU N270   @ 1.60GHz
/0/5/6                            memory      32KiB L1 cache
/0/5/7                            memory      512KiB L2 cache
/0/5/0.1                          processor   Logical CPU
/0/5/0.2                          processor   Logical CPU
/0/10                             memory      1GiB System Memory
/0/10/0                           memory      1GiB SODIMM DDR2 Synchronous 533 MHz (1.9 ns)
/0/100                            bridge      Mobile 945GME Express Memory Controller Hub
/0/100/2                          display     Mobile 945GME Express Integrated Graphics Controller
/0/100/2.1                        display     Mobile 945GM/GMS/GME, 943/940GML Express Integrated Grap
/0/100/1b                         multimedia  82801G (ICH7 Family) High Definition Audio Controller
/0/100/1c                         bridge      82801G (ICH7 Family) PCI Express Port 1
/0/100/1c/0                       generic     SD/MMC Host Controller
/0/100/1c/0.2                     generic     Standard SD Host Controller
/0/100/1c/0.3                     generic     MS Host Controller
/0/100/1c.1                       bridge      82801G (ICH7 Family) PCI Express Port 2
/0/100/1c.1/0          eth1       network     BCM4312 802.11b/g
/0/100/1c.2                       bridge      82801G (ICH7 Family) PCI Express Port 3
/0/100/1c.2/0          eth0       network     RTL8101E/RTL8102E PCI Express Fast Ethernet controller
/0/100/1d                         bus         82801G (ICH7 Family) USB UHCI Controller #1
/0/100/1d.1                       bus         82801G (ICH7 Family) USB UHCI Controller #2
/0/100/1d.2                       bus         82801G (ICH7 Family) USB UHCI Controller #3
/0/100/1d.3                       bus         82801G (ICH7 Family) USB UHCI Controller #4
/0/100/1d.7                       bus         82801G (ICH7 Family) USB2 EHCI Controller
/0/100/1e                         bridge      82801 Mobile PCI Bridge
/0/100/1f                         bridge      82801GBM (ICH7-M) LPC Interface Bridge
/0/100/1f.1            scsi0      storage     82801G (ICH7 Family) IDE Controller
/0/100/1f.1/0.0.0      /dev/sda   disk        15GB STEC PATA 16GB
/0/100/1f.1/0.0.0/1    /dev/sda1  volume      47MiB Windows FAT volume
/0/100/1f.1/0.0.0/2    /dev/sda2  volume      6450MiB Windows NTFS volume
/0/100/1f.1/0.0.0/3    /dev/sda3  volume      8189MiB Extended partition
/0/100/1f.1/0.0.0/3/5  /dev/sda5  volume      972MiB Linux swap / Solaris partition
/0/100/1f.1/0.0.0/3/6  /dev/sda6  volume      3341MiB Linux filesystem partition
/0/100/1f.1/0.0.0/3/7  /dev/sda7  volume      3812MiB Linux filesystem partition
/0/100/1f.1/0.0.0/3/8  /dev/sda8  volume      62MiB Linux filesystem partition
/0/100/1f.3                       bus         82801G (ICH7 Family) SMBus Controller
/1                                power       Dell
/2                     usb0       network     Ethernet interface
  File: "/var/lib/apt/lists/br.archive.ubuntu.com_ubuntu_dists_karmic_main_binary-i386_Packages"
  Size: 8444021   	Blocks: 16504      IO Block: 4096   arquivo comum
Device: 806h/2054d	Inode: 567         Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2009-09-01 01:19:04.382081052 -0300
Modify: 2009-08-31 23:12:11.000000000 -0300
Change: 2009-09-01 01:17:39.215079536 -0300