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I am trying to extract a password protected .7z file with p7zip -d filename.7z command. Unlike on Windows, on Ubuntu I do not get a prompt to enter password. Instead the terminal throws an E_NOTIMPL error. Could it be that the file is corrupted? Or am I doing it wrong?

  • Wonderful! I've converted my comment to an answer. – Thomas Ward Dec 25 '15 at 2:32
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There is a known bug/limitation in p7zip, in which it cannot work with password-protected encrypted files (technically by design as a 'lighter' kind of 7zip), and throws the error you've stated here when it tries to work with them.

The correct approach for encrypted/passwords 7z files is to use p7zip-full instead of p7zip, which should then work as it should.

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