Terminal and Software Center disappear In Ubuntu 10.10 [closed]

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http://askubuntu.com – Possible Duplicate: How do I fix a “Problem with MergeList” error when trying to do an update? I am using Ubuntu 10.10. While I was working, terminal was disappeared and after some time Software center also disappeared. Also, I am not able to reboot my system now. The error looks like: Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: 'E:Encountered a section with no Package: header, E:P (HowTos)