Is there any way to change configuration of IP address like in old distribution like 17.10 and 11.04. For example I've changed Ip address in /etc/network/interfaces but in 20.04 it's impossible to do this way and netplan is not easy to use.

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Yes, things change and systemd has taken control over many parts of linux. If you wnat a static ip for your device create a file with sudo:

/etc/systemd/network/myconnection.network [Match] Name=enp0s25 #check your interfaces for this name [Network] DNS=10.10.0.3 #DNS, it may be like the gateway Address=10.10.0.10/24 #the ip address of your device Gateway=10.10.0.1 #your router

I've commented the entries (I assumed that your local gateway is 10.10.0.1 - you must use yours of course)

That done the systemd service has to be enabled:

systemctl enable systemd-networkd systemctl start systemd-networkd

Now you are set. The "enabled" keyword ensures, that the service will be started after a reboot, the "start" does it (once) immediately

You can check if everthing works with networkctl status enp0s25whereas your netwrok device may differ. The name of your device can be checked with:

ip a

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