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Ubuntu Tricks - how to generate a list of installed packages and use it to reinstall packages

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linux-howto

http://www.arsgeek.com – now you’ve got a list of all of your installed debs in a fairly small file. In my case, I simply moved this file to a thumb-drive. You could also store it on a separate partition or on a disk somewhere. Heck, it’s not that big, email it to your gmail account. (HowTos)