Update Manager installing next os version (11.10) error

[Alden Davidson]

Update Manager said there was a newer version of Ubuntu available, so I clicked the button for it to install.
It ran everything, but at some point in the process, it threw up an error which told me to type "ubuntu-bug update-manager" (or something like that) into a terminal, and I did, and so here I am.
However, it does seem to have continued the installation as normal, with nothing obviously wrong, but time will tell if that's actually true or not.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5.2
ProcVersionSignature: Ubuntu 2.6.38-14.58-generic 2.6.38.8
Uname: Linux 2.6.38-14-generic x86_64
Architecture: amd64
Date: Sat Apr 28 00:50:18 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Zorin OS 5.2 64bit - Release amd64
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=C:en
 LANG=
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2012-04-28 (0 days ago)
VarLogDistupgradeApttermlog:

VarLogDistupgradeHistorylog:

VarLogDistupgradeSystemstatetargz:

VarLogDistupgradeTermlog:

[Alden Davidson (davidsonalden)]

It appears that due to the fact that Zorin is modified from the original Ubuntu ISO, I'm not supposed to update using any official ubuntu updates (11.10, 12.04) that pop up in update manager, since it will cause problems.