Why do I receive an error message when I try to install new software on Ubuntu 12.10?

sandeepsingh rawat March 20, 2013
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this is seen while installing a new software or applying a new theme.

In terminal:

E: Could not open lock file /var/lib/apt/lists/lock – open (13: Permission denied)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not open lock file /var/lib/dpkg/lock – open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

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