Questions[update-manager](ubuntu)

I tried to do an update to my system (12.04 LTA 64bit, on ACER aspire V5) got this:

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/security.ubuntu.com_ubuntu_dists_precise-security_main_binary-i386_Packages,
E:The package lists or status file could not be parsed or opened.

Now What?

I configured this:

Automatically check for updates: Never

But the update manager keeps poping up against my wishes, I have no control. I feel like I'm using Windows again.

I want to be able to install updates from time to time, manually.

What can I do?

I am not sure what caused this error, but here is what the whole error says, and also this is sitting as a notification, and preventing me from updating any software using Update Manager - Please provide some assistance or tell me how to figure out what to do to fix it.

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

It didn't fixed the error. So, how do I fix my GUI update?

For every software I have to install it from command line because I got same error when install software from Ubuntu Software Center.

So here is my story...

I was doing upgrades to ubuntu the other day, and the power went out right in the middle of the upgrade, so now when I try to do upgrades it keeps asking me if I want to do a partial upgrade. I have heard this is bad and should be avoided, I also know there is a way to fix this via the command line, but I can't remember how, nor can I find anything on the internet.

Any help would be appreciated. Thanks