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After upgrading to Ubuntu 13.10 I was not able to access the Internet on any program that required it. So I uninstalled Firefox but I could reinstall from the software center so I used the terminal, everything ran smoothly, I told me how much additional space would be used, then it said

"Err http://us.archive.ubuntu.com /ubuntu/     saucy/main Firefox i386 24.0+build1-0ubuntu1
      Could not resolve 'us.archive.ubuntu.com
 Failed to fetch  http://us.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_24.0+build1-0ubuntu1_i386.deb
       Could not resolve 'us.archive.ubuntu.com'
  E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?" 

And with both given possible fixes I also get errors. Please help, it's been like this sense the day the 13.10 update was released

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