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I'm trying to find a solution for a few days, I hope someone can answer me. I tried several times to install flash player through lubuntu software center, and after I hit "Install Packages" it gives me an error:

 Failed to load the package list
This is a serious problem. Try again later. If this problem appears again, please report an error to the developers. >Details E:Type 'sudo' is not known on line 60 in source list /etc/apt/sources.list .

I think that I accidently, couple weeks ago, tried to add reposetories to my sources.list and I saved it. If this the problem, is there a way to make a new sources.list?

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Does your /etc/apt/sources.list file contain a line starting with sudo? This file should normally contain only lines starting with deb or deb-src and comments starting with #. – chronitis Oct 11 '13 at 12:53

The line 60 of your sources.list has something that it shouldn't have. You can fix the line using sed:

sudo sed -e '60d' /etc/apt/sources.list

The -e edit the file in place, the 60 indicates the line, d indicates that stop right there.

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