Rng-tools5 is incompatible with Linux kernel 5.6

[奧田愛美]

Rng-tools5 (installed with apt-get install rng-tools5) is incompatible with Linux kernel 5.6 in Ubuntu 20.04.
https://en.wikipedia.org/wiki//dev/random
In October 2016, with the release of Linux kernel version 4.8, the kernel's /dev/urandom was switched over to a ChaCha20-based cryptographic pseudorandom number generator (CPRNG) implementation by Theodore Ts'o, based on Bernstein's well-regarded stream cipher ChaCha20.
In 2020, the Linux kernel version 5.6 /dev/random only blocks when the CPRNG hasn't initialized. Once initialized, /dev/random and /dev/urandom behave the same.
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