unbound rasbian root.key

unbound_root_key_fix.txt

Could you post content of above file here first pls?

cat /var/lib/unbound/root.key

To try and fix that file, stop unbound with below:

sudo systemctl stop unbound

Remove the broken file with below:

sudo rm /var/lib/unbound/root.key

Run below to attempt to fix it:

sudo -u unbound unbound-anchor -va /var/lib/unbound/root.key

And restart unbound and check journals again?

sudo systemctl restart unbound

journalctl --no-pager --full -u unbound