Wifi and ethernet stopped to work

[pferreiraov]

Hi, wifi and ethernet connections stopped to work on my ubuntu 19.04. I've already tried an USB wifi dongle, an offboard ethernet board and change cables and ethernet ports. Nothing solve the problem. I have internet connection in others computers and on my smartphone. Could anyone help?

I'm getting the message:

"Connection failed, fail to activate network connection".

[pferreiraov]

I only have ubuntu 19.04 on this computer, no other OS.
The internet stop to work when I was downloading files.