Ubuntu Software Source File Error

Possible Duplicate: How do I remove a malformed line from my sources.list? “Malformed line 6” error in my /etc/apt/sources.list

My Software Center is not opening or closing by itself:

E:Malformed line 57 in source list /etc/apt/sources.list (dist parse) E:The list of sources could not be read E:The package lists or status file could not be parsed or opened.

i am trying to update Ubuntu via terminal, but it gives the error message as bellow

E: Malformed line 1 in source list /etc/apt/sources.list.d/google.list (dist parse) E: The list of sources could not be read.

my Ubuntu software center could be the problem?

well here is the error hope i can get some help, i show you the update manager and the line of the error, if you need something else just ask for it![enter image description here][1]

update manager error prompt:

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:Mal

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

On running update manager. Also software update center not working. What should I do?

I am trying to update/add a repository.

I am about as green as they come, I recently updated to xubuntu 12.10 from an older suite. I followed instructions I found in other postings

$ cat -n /etc/apt/sources.list | grep 62

62 deb http://ppa.launchpad.net/jonabeck/ppa/xubuntu main

$ sudo gedit /etc/apt/source.list

the source list opened and the document was blank.

Hi all, Not sure if this is the right place for this thread... Pretty new to reporting here.

Error as follows:

avish@avish-Aspire-one:~$ sudo apt-get update

E: Malformed line 43 in source list /etc/apt/sources.list (dist parse)

E: The list of sources could not be read.

First of all say apology to Ask Duplicate Question.

I'm Using First time Ubuntu 12.10 OS.when i'm update the Update Manager it is giving error like this ....

Failed to load the package list:

This is a serious problem. Try again later.