This system doesn't provide enough entropy to quickly generate high-quality random numbers

This system doesn't provide enough entropy to quickly generate high-quality random numbers.Installing the rng-utils/rng-tools, jitterentropy or haveged packages may help.On virtualized Linux environments, also consider using virtio-rng.The service will not start until enough entropy has been collected.

當然是安裝嘍，運行如下命令安裝

sudo apt-get install rng-tools
sudo rngd -r /dev/urandom

在次運行剛纔的命令，提示就沒了。