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When I try to (not from terminal) the following error message opens up:

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:Malformed line 60 in source list /etc/apt/sources.list (dist parse)' 

Using Ubuntu 12.04, thanks.

Edit: Went to line 60, this is what I found:

deb partner

Edit: Commented the line out, software manager works fine now.

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Please open /etc/apt/sources.list with gedit, go to line 60, copy the entire line and post it here. – Eric Carvalho Dec 9 '12 at 13:09

You have a mistake in your sources list.

To go straight to the sources list, open a Terminal and issue the command: gksudo gedit /etc/apt/sources.list.

Look for the mistake at line 60.

If you have any trouble copy and paste your sources list here so we can have a look.

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