Connect to Wifi from console

https://help.ubuntu.com/community/WifiDocs/WPAHowTo

sudo iwlist wlan0 scan | grep ESSID
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

# put
network={
    ssid="ESSID"
    psk="Password"
}

# Change should happen automactically. If not:
sudo ifdown wlan0 && sudo ifup wlan0

If this does not help

# https://help.ubuntu.com/community/WifiDocs/WPAHowTo

ifconfig -a # something like wlp2s0 or wlan0 is interface

wpa_supplicant # get drivers

sudo iwlist wlp2s0 scan | grep ESSID

# wexy is driver
sudo wpa_supplicant -iwlp2s0 -c/etc/wpa_supplicant/wpa_supplicant.conf -Dwext

# Reboot helps sometimes!

nano /etc/network/interfaces

iface wlp2s0 inet dhcp
wpa-driver wext
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

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