UBUNTU 18.04wget: unable to resolve host address ‘*my.proxy’

I’m new in the Linux world especially in UBUNTU OS and networking.

I’m working on a server with UBUNTU 18.04, and having trouble with everything that includes networking. I’ve set in wired network setting the correct proxy I’m using on a 16.04 UBUNTU version(all the setup is the same as in the 18.04 version).

I’ve tried several times to define the proxy from the beginning and most of the guides are not much of a help for me.

Please advise.