How to reconfigure Ubuntu 11.10
I've made a failure and made update of Ubuntu to 11.10. Now I'm stuck with system that runs in 30 %:

    - login screen (GUI) doesn't appear,
    - dpkg-reconfigure stopps with "dpkg-maintscript-helper: error: couldn't identify the  package"
    - I have no gnome, no panels, no menus

    + I have simple x with Desktop and File/Edit/View/Go/Bookmark/Help on top,
    + I have access to console (on other terminal or via OpenInTerminal)

I wanted to disable unity and switch to old gnome. I followed few tutorials, and now I'm in the middle of nowhere.

Is there any way to refresh all 11.10 settings and packages ?
How to reconfigure Ubuntu 11.10
===

I've made a failure and made update of Ubuntu to 11.10. Now I'm stuck with system that runs in 30 %:

    - login screen (GUI) doesn't appear,
    - dpkg-reconfigure stopps with "dpkg-maintscript-helper: error: couldn't identify the  package"
    - I have no gnome, no panels, no menus

    + I have simple x with Desktop and File/Edit/View/Go/Bookmark/Help on top,
    + I have access to console (on other terminal or via OpenInTerminal)

I wanted to disable unity and switch to old gnome. I followed few tutorials, and now I'm in the middle of nowhere.

Is there any way to refresh all 11.10 settings and packages ?