sudo apt-get clean
升级包目录:/var/cache/apt/archives 备份快速设置已下载的部分软件包,以便重装系统再次使用,免去重新下载的时间 tar cizvf backup.tar.gz /var/cache/apt/archives --exclude=/var/cache/apt/archives/partial/* --exclude=/var/cache/apt/archives/lock