This appears to be a typo in /etc/default/rng-tools as a result of copy&paste from a blog posting (don't do this: one day your machine will be compromised). Try:
RNGDOPTIONS="--hrng=tpm --fill-watermark=90% --feed-interval=1"
This appears to be a typo in /etc/default/ rng-tools as a result of copy&paste from a blog posting (don't do this: one day your machine will be compromised). Try:
RNGDOPTIONS= "--hrng= tpm --fill- watermark= 90% --feed-interval=1"