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Unable to install any package

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linux-howto

http://askubuntu.com – When I try to install ANY application through terminal, I get this error: Reading package lists... Error! E: Read error - read (21: Is a directory) E: The package lists or status file could not be parsed or opened. And software center is also not opening. Neither is Synaptic Package Manager. It gives the following error when I try to open it: E: Read error - read (21: Is a directory) E: The package lists or status file could not be parsed or opened. E: _cache->open() failed, please report. Solutions I tried so far, but didn't fix the problem: sudo rm -rf /var/lib/apt/lists/archive.u (HowTos)