Sometimes I can’t find wireless networks which I know exist (on Ubuntu 16.04). Forcing the wireless interface to rescan fixes the problem.
This is really simple. Just find out the name of your wireless interface:
You should have a few options, probably something like ‘eth’ or ‘enp’ (ethernet), a ‘lo’ (local loopback) and a wireless interface (mine is ‘wlp2s0’). The command to force the rescan is then:
$ sudo iwlist wlp2s0 scan
Replacing the ‘wlp2s0’ with your interface name. Of course, I can never remember this, so I usually add an alias to my bashrc file:
$ vi ~/.bashrc alias rescan="sudo iwlist wlp2s0 scan" $ source ~/.bashrc
Then simply typing “rescan” into a terminal asks for root password and then rescans the network.