Mounting encrypted USB disk fails because cryptsetup is not installed by default

[Jonathan Ernst]

Steps to reproduce :

1) Take your encrypted USB disk to your friend's place
2) Nautilus asks for the passphrase
3) Type the passphrase
4) Nautilus shows an error because 'crypsetup' cannot be found

Expected results :

1) The system tells the user that the cryptsetup package should be installed in order to read the disk.
2) Cryptsetup is then installed
3) The disk is mounted

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: udisks 1.0.4-1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Nov 13 16:15:23 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20111007)
MachineType: LENOVO 8918DEG
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=14afcc65-7dcc-4542-846f-563336463e6a ro quiet splash vt.handoff=7
SourcePackage: udisks
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/20/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 7KETB2WW (2.12 )
dmi.board.name: 8918DEG
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:bvr7KETB2WW(2.12):bd02/20/2008:svnLENOVO:pn8918DEG:pvrThinkPadR61:rvnLENOVO:rn8918DEG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 8918DEG
dmi.product.version: ThinkPad R61
dmi.sys.vendor: LENOVO