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====== Alle installierten Packages (auf einem leeren System) installieren ======

Von https://askubuntu.com/questions/9135/how-to-backup-settings-and-list-of-installed-packages

A quick way of backing up a list of programs is to run this:

  dpkg --get-selections > ~/Package.list
  sudo cp -R /etc/apt/sources.list* ~/
  sudo apt-key exportall > ~/Repo.keys

It will back them up in a format that dpkg can read* for after your reinstall, like this:

  sudo apt-key add ~/Repo.keys
  sudo cp -R ~/sources.list* /etc/apt/
  sudo apt-get update
  sudo apt-get install dselect
  sudo dselect update
  sudo dpkg --set-selections < ~/Package.list
  sudo apt-get dselect-upgrade -y

* You may have to update dpkg's list of available packages or it will just ignore your selections (see this debian bug for more info). You should do this before sudo dpkg --set-selections < ~/Package.list, like this:

  apt-cache dumpavail > ~/temp_avail
  sudo dpkg --merge-avail ~/temp_avail
  rm ~/temp_avail