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I've recently installed Ubuntu, and tried installing steam. It wouldn't start so naturally I went "Google has the answer", and it had. My problem is this: this line won't run.

sudo dpkg --add-architecture i386

It tells me this when I enter it: dpkg: error: unknown option --add-architecture.

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2 Answers

Try to follow this guide: Steam Quick Install

There's a part there for x64 :) Worked for me

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That's not helpful, as that guide has the failing step in it. –  Yet Another User May 7 '13 at 20:59
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The version of APT in 12.04 is slightly older than the time they fixed multiarch support. Your error is because of the version of APT not supporting multiarch properly. That guide only, as far as I know, works on 12.10 and newer.

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