Ubuntu 软件包备份与清理

* 备份

sudo tar cizvf backup.tar.gz /var/cache/apt/archives --exclude=/var/cache/apt/archives/partial/* --exclude=/var/cache/apt/archives/lock

* 清理

sudo apt-get clean
sudo rm -rf ~/.thumbnails/fail/gnome-thumbnail-factory/*

* 还原

sudo apt-get update && sudo tar xzvf backup.tar.gz -C /