本文介绍了一种简便的方法来备份当前系统中的已安装软件包列表，并提供了详细的步骤来实现这一过程。通过几个简单的命令即可完成备份，再利用这些备份文件进行系统重新安装后的软件恢复。
Recovery
A quick way of backing up a list of programs is to run this:
dpkg --get-selection
sudo cp /etc/apt/source
sudo apt-key exportall > ~/Repo.keys
A quick way of backing up a list of programs is to run this:
dpkg --get-selection
sudo cp /etc/apt/source
sudo apt-key exportall > ~/Repo.keys
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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 ~/sources.list /etc/apt/source
sudo apt-get update
sudo apt-get install dselect
sudo dpkg --set-selection
sudo apt-get dselect-upgrade -y
sudo apt-key add ~/Repo.keys
sudo cp ~/sources.list /etc/apt/source
sudo apt-get update
sudo apt-get install dselect
sudo dpkg --set-selection
sudo apt-get dselect-upgrade -y
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