"Desktop Pager" Settings: 'Unable to extract the file "6"' (and then opens the wrong obconf tab)

SRU explanation :
[Impact] : The configuration of desktop number by the panel shortcut is broken, which is annoying for people clicking on the option.

[Development Fix] : The bug is fixed in 2.0.3+git20110808-0ubuntu2 in precise.

[Stable Fix] : The same fix can be used (see http://launchpadlibrarian.net/83531381/obconf_2.0.3%2Bgit20110808-0ubuntu1_2.0.3%2Bgit20110808-0ubuntu2.diff.gz)

[Test Case] (from the original report) :
Log into LXDE or Lubuntu.
Find the pager on the bottom panel. (The two gray squares).
Right click on it & select "Desktop Pager" settings.
-> Error dialog: Unable to extract the file "6".

[Regression Potential] Minimal : this patch was already tested in 10.10 without any problems. The fix just re-enable the feature dropped in an upload on Oneiric.

Original report :
Log into LXDE.
Find the pager on the bottom panel. (The two gray squares).
Right click on it & select "Desktop Pager" settings.

-> Error dialog:

Unable to extract the file "6".
Please ensure that "/home/alan/.themes" is writable and that the file is a valid Openbox theme archive.
The following errors were reported:
tar (child): 6: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

Also, the obconf error dialog is buggy. While it's up, the main obconf window doesn't respond. But it's not being treated as a normal modal dialo. When I click on the taskbar entry for obconf, I get the main obconf window, instead of the error dialog (which I need to close before I can use the main obconf window).

Finally, after closing the error dialog, obconf shows the Themes tab. The tab relevant to the pager is actually the "Desktops" tab. (This may well be a side-effect of the original problem).

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lxpanel 0.5.8-1ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Config_Home_LXDE:
 [Command]
 FileManager=pcmanfm %s
 Terminal=x-terminal-emulator
 Logout=lxde-logout
Date: Tue Oct 18 13:52:30 2011
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
SourcePackage: lxpanel
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (4 days ago)