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[ubuntu] Failed to install Software

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linux-howto

http://ubuntuforums.org – Hello Everyone..... Iam unable to install any software from ubuntu Software center... It is giving error message as "Failed to install package...check your internet connection... and then another error "requires installaton of untrusted packages....The action would require the installation of packages from not authenticated sources" iam using ubuntu 11.10... What might be the problem... this is the second time iam facing the same problem.... previously it was solved by using "sudo apt-get update" command... but this time it is not working... Please help me... (Hardware)