我有一个新的 Ubuntu Digital Ocean Droplet，它的根空间一直不足。
df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 2013876 0 2013876 0% /dev
tmpfs 404640 10740 393900 3% /run
/dev/vda1 81120924 81104144 396 100% / <----------<<<<< 396k space left after running apt clean commands. it keeps going down to 0
tmpfs 2023196 0 2023196 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 2023196 0 2023196 0% /sys/fs/cgroup
/dev/sda 363979364 245756248 99856652 72% /mnt/volume-nyc1-04
/dev/vda15 106858 3437 103421 4% /boot/efi
tmpfs 404640 0 404640 …