random: 7 urandom warning(s) missed due to ratelimiting

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kvm上的debian虚拟客户机，升级操作系统到buster之后，重启内核启动缓慢:

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\[ 3.126166\] ppdev: user-space parallel port driver
\[ 138.280959\] random: crng init done
\[ 138.280968\] random: 7 urandom warning(s) missed due to ratelimiting

随机数产生存在问题，以下方法解决

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sudo apt-get install haveged
sudo systemctl enable haveged
sudo systemctl start haveged

References:
[1]Debian Testing takes a long time to load. Crng init done [closed]
[2]random: 7 urandom warning(s) missed due to ratelimiting