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@girish
I don't have static public IP address, I workaround that with DDNS and Cloudflare.
I have NAS with homecloud funcionality and that work fine when I connecting remotly.

@girish
These commands nothing change.
I don't have pihole or something like that... I got typical router TP-LINK C1700.

@girish
systemctl status unbound

● unbound.service - Unbound DNS server
     Loaded: loaded (/lib/systemd/system/unbound.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2022-03-21 19:17:06 UTC; 4min 15s ago
       Docs: man:unbound(8)
   Main PID: 4609 (unbound)
      Tasks: 1 (limit: 9436)
     Memory: 8.5M
     CGroup: /system.slice/unbound.service
             └─4609 /usr/sbin/unbound -d

Mar 21 19:16:15 ubuntu systemd[1]: Starting Unbound DNS server...
Mar 21 19:16:15 ubuntu package-helper[4595]: /var/lib/unbound/root.key does not exist, copying from /usr/share/>
Mar 21 19:17:05 ubuntu package-helper[4599]: /var/lib/unbound/root.key has content
Mar 21 19:17:05 ubuntu package-helper[4599]: fail: the anchor is NOT ok and could not be fixed
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 0: subnet
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 1: validator
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 2: iterator
Mar 21 19:17:06 ubuntu unbound[4609]: [4609:0] info: start of service (unbound 1.9.4).
Mar 21 19:17:06 ubuntu systemd[1]: Started Unbound DNS server.

journalctl -u unbound -a

-- Logs begin at Mon 2022-03-21 19:13:02 UTC, end at Mon 2022-03-21 19:20:58 UTC. --
Mar 21 19:16:15 ubuntu systemd[1]: Starting Unbound DNS server...
Mar 21 19:16:15 ubuntu package-helper[4595]: /var/lib/unbound/root.key does not exist, copying from /usr/share/>
Mar 21 19:17:05 ubuntu package-helper[4599]: /var/lib/unbound/root.key has content
Mar 21 19:17:05 ubuntu package-helper[4599]: fail: the anchor is NOT ok and could not be fixed
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 0: subnet
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 1: validator
Mar 21 19:17:05 ubuntu unbound[4609]: [4609:0] notice: init module 2: iterator
Mar 21 19:17:06 ubuntu unbound[4609]: [4609:0] info: start of service (unbound 1.9.4).
Mar 21 19:17:06 ubuntu systemd[1]: Started Unbound DNS server.

@girish
service work, have status running but after completed second command I got.

Connection timed out; no server could be reach.

My server is on my local network behind router, fresh ubuntu install work fine witch apt and etc. I even got other ubuntu working at the same network.

I got the same problem... After install fresh ubuntu 20.04 or 18.04 I run install script but stopped at the same moment. Suddenly I cannot connect to internet, after short test it's looks like my server stopped resolving domain names resolv.conf file is directing to server itself (nameserver 127.0.0.1)
My network adapter in configured to DHCP client, all installation of Ubuntu I use as default as posible.