Possible Duplicate:
“Problem with MergeList” error when trying to do an update

Just now I installed ubuntu 12.04 on my Lenovo G570 laptop. First I got an error at the time of installation (don't know about it) and I restarted the system and next time, it went well. So, after installing problems started..

1. There was a error with "Language recognition" and I tried to fix it but didn't work.

2. I tried to install powerTop to check the status of power management.

   at terminal: sudo apt-get install powertop

This is the error I got

surya@surya-Lenovo-G570:~$ sudo apt-get powertop install
[sudo] password for surya: 
E: Invalid operation powertop
surya@surya-Lenovo-G570:~$ sudo apt-get install powertop
Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.
surya@surya-Lenovo-G570:~$ ^C
surya@surya-Lenovo-G570:~$ ^C
surya@surya-Lenovo-G570:~$ ^C
surya@surya-Lenovo-G570:~$ 

1. I downloaded Google Chrome .deb one and tried to install but its not working. Software center is opened and its not loading.

There was a notification on the status bar which says:

An error occurred please run the package manager from the right-click menu ... 
....

...

E: Encountered a section with no Package: header
    E: Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages

1. "Copy & Paste" from terminal is not really working...

When I press Ctrl + C; its showing ^C on terminal but its not working..

1. The most important error: I am unable to see a "chip" icon on the status bar so as to install proprietary drivers for my ATI drivers...

The interesting part is, powertop worked will on live cd and it even detected my ATI card.

Update

When I opened "Software Up to Date", this showed a error:

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:Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages, E:The package lists or status file could not be parsed or opened.'

: My laptop details

Lenovo G570; Intel 2nd Gen i5 processor

4GB DDR3 RAM

Intel in-build graphics + AMD Radeon HD 6370M 1GB graphics.

I need help ASAP.