Formatting of "Release Notes" window
Workaround:
Run:
gconf-editor /apps/update-manager
Clear the value in key "check_new_release_ignore"
Run:
killall -r check-new-release-gtk
/usr/lib/update-manager/check-new-release-gtk
Result:
The update-manager window is probably missing the show_uri (webkit.webview). Looking at update-manager on 11.10, it has a DistUpgradeFetcher.py (showReleaseNotes) that falls back to text for some reason (maybe something in ReleaseNotesViewer.py ?).
Please file a bug report about it:
ubuntu-bug update-manager
Well, to be honest on your own you cannot solve this unless you are a coder and willing to submit a patch against the code for the update manager ;).
That happens because the two windows you see are using different methods for rendering the text, and this can only be fixed at the code level (not by simply tweaking some setting).