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I've tried installing through sudo apt-get install and software center for both Synaptic and Grace (a plotting tool). For sudo apt-get install, I get

E: Package 'synaptic' has no installation candidate

and for the software center I'm getting:

there isn't a software package called "grace" in youc current software sources  

I have "main", "universe", "restricted", and "multiverse" checked for software sources. I'm an ubuntu noob. Thanks!

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Try running sudo apt-get update, then try installing your packages again. – Seth Jan 26 '13 at 21:03
I've tried that as well to no avail, but thanks! – user126350 Jan 26 '13 at 21:13
Please put the content of /etc/apt/sources.list into your question. – guntbert Jan 26 '13 at 21:44

in terminal type this:

sudo add-apt-repository "deb quantal main"

and than type

sudo apt-get update

after this you should be able to install synaptic through software centre

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BTW i use this on my 13.04 testing setup – apfelsine Jan 26 '13 at 22:40
Thanks apfelsine. I gave this a shot, but no luck! Any other thoughts? – user126350 Jan 28 '13 at 5:43
looks like something is broken there, the easiest way you can always reinstall ubuntu – apfelsine Feb 2 '13 at 9:35

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