time echo "scale=5000; 4*a(1)" | bc -l -q3.141592653589793238462643383279502884197169399375105820974944592307\81640628620899862803482534211706798214808651328230664709384460955058\223172535940812848111745028410270193852110555964462294895493038196
方式一(路径不要改): 挂载光驱到到本地的指定目录 mount /dev/cdrom /media/cdrom 然后执行: apt-cdrom -m -d /media/cdrom add 会写配置文件 然后执行: apt-get update 就可以使用 方式二:直接添加方式 mount /dev/cdrom /mnt root@grandocean:/etc/apt# vim /etc/apt/sources.list 添加 deb file:///mnt raring main deb f