I installed pihole yesterday from cratch with bullseye on the raspberry pi, i get this failure:
root@206:/etc/unbound/unbound.conf.d# service unbound restart
Job for unbound.service failed because the control process exited with error code.
See "systemctl status unbound.service" and "journalctl -xe" for details.
root@206:/etc/unbound/unbound.conf.d#
Jan 05 15:28:43 206 systemd[1]: unbound.service: Scheduled restart job, restart counter is at 5.
Jan 05 15:28:43 206 systemd[1]: Stopped Unbound DNS server.
Jan 05 15:28:43 206 systemd[1]: unbound.service: Start request repeated too quickly.
Jan 05 15:28:43 206 systemd[1]: unbound.service: Failed with result 'exit-code'.
Jan 05 15:28:43 206 systemd[1]: Failed to start Unbound DNS server.
pi@206:~ $
sudo journalctl -xe gives the next only last lines:
░░ The job identifier is 10385.
Jan 06 12:54:49 206 kernel: hwmon hwmon1: Undervoltage detected!
Jan 06 12:54:53 206 kernel: hwmon hwmon1: Voltage normalised
Jan 06 12:56:37 206 sudo[4336]: pi : TTY=pts/0 ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/journalctl -xe
Jan 06 12:56:37 206 sudo[4336]: pam_unix(sudo:session): session opened for user root(uid=0) by pi(uid=1000)