Cannot connect to WiFi.
My ISP replaced my old modem with the new one. I changed my WiFi
Authentication key and the name of the WiFi network. Then I made Network
Manager to "forget" my old WiFi. Network Manager finds my new WiFi but I
cannot connect to it.
When "Authentication Key is required" dialog pops up and the key is
entered,j Connect button remains grayed out/disabled. Thus there is no
way to get through but pressing Cancel button.
I'm running Debian Stretch.
Could somebody help. It's quite urgent now.