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Best way to backup all settings, list of installed packages, tweaks, etc?

I currently have Ubuntu 10.10 installed on my laptop. Configured just the way I like it. Now I need to reinstall everything because I have a need to encrypt my whole hard drive and on Ubuntu, that can only be done using the alternate CD. Question is what would be a good way to reinstall everything including sources and PPA's after encryption?

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  1. Find some removable medium, e.g. a flash drive.
  2. Save /etc/apt/sources.list and every file in /etc/apt/sources.list.d/ to it.
  3. Open System > Administration > Synaptic Package Manager. Go to File > Save Markings As... , check the box labeled "Save full state, not only changes", and save it to the removable medium. This file is basically a list of every single package you have installed.

Once you've reinstalled:

  1. Restore your /etc/apt/sources.list and contents of /etc/apt/sources.list.d/ to the computer.
  2. Open Synaptic again, and press Reload.
  3. Still in Synaptic, go to File > Read Markings. Open the markings file you saved previously. Then press Apply, sit back, and relax.
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