USB drives won't mount

[Lazlo]

1)
Description: Ubuntu 11.10
Release: 11.10

2)
udev:
Installed: 173-0ubuntu4

3)
USB drive mounts and is accessible.

4)
USB drive mount but is not accessible, error message: Not authorized.
---
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CheckboxSubmission: f98186557c4fce5b597251bb5c2615ec
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
DistroRelease: Ubuntu 11.10
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LENOVO 12983RG
Package: udev 173-0ubuntu4
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic root=UUID=cfac897b-296f-49d6-bf17-ce151ffabc4c ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-13.21-generic 3.0.6
Tags: oneiric running-unity
Uname: Linux 3.0.0-13-generic x86_64
UpgradeStatus: Upgraded to oneiric on 2011-10-01 (24 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 09/16/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8NET29WW (1.13 )
dmi.board.asset.tag: Not Available
dmi.board.name: 12983RG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8NET29WW(1.13):bd09/16/2011:svnLENOVO:pn12983RG:pvrThinkPadEdgeE320:rvnLENOVO:rn12983RG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 12983RG
dmi.product.version: ThinkPad Edge E320
dmi.sys.vendor: LENOVO

[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

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[Lazlo (lazlo-deactivatedaccount)]

My /etc/lightdm/lightdm.conf contained autologin-user=<user>.

Commenting out this line solved this issue for me. Autologin was not active - I had to login with password, and I never selected autologin.