Ubuntu server 20.04 no internet connection

I have a host with Ubuntu server 20.04 installed on it. The server is connected with ethernet cable to a PowerLine repeater. After installation, there is no internet connection; so, I searched on google and I found I have to manipulate Netplan. I did it, configuring the configuration file to set a static IP, but it still does not works.

This is my current Netplan yaml file code:

network: version: 2 renderer: networkd ethernets: enp4s0: dhcp4: no addresses: [192.168.1.20/24] gateway4: 192.168.1.1 nameservers: addresses: [8.8.8.8,8.8.4.4]

where, of course, 192.168.1.20 is the static IP form my server and 192.168.1.1 my gateay, which is my home router.

I checked my routes, to find if default duplicated routes are present, but seems not. This the output of ip route command:

default via 192.168.1.1 dev enp4s0 proto static
192.168.1.0/24 dev enp4s0 proto kernel scope link src 192.168.1.20 

I checked also the resolv.conf file, but it is set with only google DNS entry:

nameserver 8.8.8.8

The IP seems to be well configured after netplan change applied:

root@ubuntuserver:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether e0:3f:49:7c:60:45 brd ff:ff:ff:ff:ff:ff inet 192.168.1.20/24 brd 192.168.1.255 scope global enp4s0 valid_lft forever preferred_lft forever inet6 fe80::e23f:49ff:fe7c:6045/64 scope link valid_lft forever preferred_lft forever
3: wg0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000 link/none inet 192.168.66.4/32 scope global wg0 valid_lft forever preferred_lft forever

However, I'm still without internet connection.

What further actions should I perform?

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