Debian backup and restore package selections

It's a good idea to safe a list of all installed packages for a reinstall

Safe a list of all selected packages

  sudo dpkg --get-selections > packages.txt

To restore all the applications from your list, you must follow a three step process very carefully.

  sudo dpkg --set-selections < packages.txt
  sudo apt-get dselect-upgrade

Ref: http://savvyadmin.com/backup-and-restore-package-lists-in-ubuntu/

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