about 40GB of data (music, pictures, ebooks) lost after update

[Anita Schmitz]

After an update I allowed on december 8th, I discovered that 4 of my most important folders were gone completely, and could not be restored by whatever actions.
In these folders were about 40GB of valuable data.
I tried to get a restore point working, but it didn't work out, so that this data seems lost.
I would appreciate any information concerning how to recover/ restore the data!

1) Ubuntu 11.04
2) unknown
3) I only expected an update, and did certainly NOT expect so many data to vanish completely!
4) As mentioned before, valuable data got lost, and could not be restored, neither using a restore point, nor by any other measures.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: software-center 5.0.2ubuntu0.1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Dec 25 03:38:46 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: Upgraded to oneiric on 2011-12-12 (12 days ago)