@lucy @iska
Oh, you brobably don't have dhclient or dhcpcd running on that interface then — your distro usually provided a more clean way to do it, but you can always run it yourself with "dhclient interface" or "dhcpcd interface" — whatever your system has installed. You can find the name of the interface out with "ip l" — it's either just wlan0 or something really weird like wlp35s18.