Public bug reported:

I've put a disk /dev/sdb2/ in fstab to auto mount on startup. but if i put usb 
memory when computer is powered off the disk won't mount.
how to replicate the bug:
1. put a disk in fstab to automount.
2. remove all usb drives, cameras etc.
3 restart computer. the disk is mounted
4. turn off the computer
5. put usb drive in
6. start the computer
7. it wont be able to mount it
If i try manualy mount /dev/sdb2 i get this

mount /dev/sdb2
NTFS signature is missing.
Failed to mount '/dev/sdb2': Invalid argument
The device '/dev/sdb2' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

the filesystem on usb drive is FAT it might have confused usb drive with sdb
the usb drive might now be sdb and the hard disk might be sdc

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.35
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
NonfreeKernelModules: hsfengine nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  nidzo      2039 F.... pulseaudio
 /dev/snd/pcmC0D0p:   nidzo      2039 F...m pulseaudio
 /dev/snd/controlC1:  nidzo      2039 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xd9ef4000 irq 23'
   Mixer name   : 'Realtek ALC662 rev1'
   Components   : 'HDA:10ec0662,10438290,00100101'
   Controls      : 34
   Simple ctrls  : 18
Card1.Amixer.info:
 Card hw:1 'CX8801'/'Conexant CX8801 at 0xda000000'
   Mixer name   : 'CX88'
   Components   : ''
   Controls      : 3
   Simple ctrls  : 2
Date: Wed Nov 24 07:19:18 2010
HibernationDevice: RESUME=UUID=45525422-07e2-4ad2-aedf-088e7ccf0b45
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
 
 vboxnet0  no wireless extensions.
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic 
root=UUID=872452b9-3436-43c2-a03d-be8c9b623250 ro quiet splash
ProcEnviron:
 LANGUAGE=sr_RS:sr
 LANG=en_GB.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
dmi.bios.date: 09/27/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0806
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N-X
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev x.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0806:bd09/27/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N-X:rvrRevx.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kernel-fs maverick needs-upstream-testing ubuntu-une

-- 
Mounting on startup won't work if usb drive is plugged in
https://bugs.launchpad.net/bugs/680793
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