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I want to change my software sources because I don't want to update my Ubuntu from other software sources. I tried to change it from Unity dock: I typed software source and a icon appeared but when I clicked nothing happened.

And then I tried it from Update manager: I clicked on edit->source but nothing happened.

I am still able to download and install updates as well as software from Ubuntu Software Center

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You could always edit it manually too. The file is at /etc/apt/sources.list . Make sure you make a backup copy of the file before you edit it so that you can go back to it if the need arises. –  nitstorm Dec 10 '11 at 13:16
    
i am using ubuntu 11.10 with kde-standard –  paru38 Dec 10 '11 at 13:17
    
The apt's sources.list file is always in the same place in every flavour of Ubuntu. So I am pretty sure the file is at /etc/apt/sources.list –  nitstorm Dec 10 '11 at 13:20
    
i am able to open file list from command line 'sudo gedit /etc/apt/sources.list' but how to know which source is offering me other software sources or unsupported sources –  paru38 Dec 10 '11 at 13:21
    
like in GUI i have to do only that only to uncheck the box which is offering me other software updates –  paru38 Dec 10 '11 at 13:24
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2 Answers

up vote 2 down vote accepted

you can open your software from

gksudo gedit /etc/apt/sources.list

here you will find your software sources

and you can chose your software sources you need every source has its description which is followed by #

you can delete the other software sources

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please make a backup before editing to list –  raj Dec 12 '11 at 16:26
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You could give this terminal command a try:

Under GNOME/Unity

gksudo software-properties-gtk

Under KDE

kdesudo software-properties-kde
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Dont see any reason for the downvote here, this actually might have worked fine. –  Bruno Pereira Dec 12 '11 at 23:48
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