https://trisquel.info/en/forum/not-all-wifi-access-points-listed
See if what Banana Magique did there can help, that is - changing the channel and restarting the Wifi router.
https://trisquel.info/en/forum/not-all-wifi-access-points-listed
See if what Banana Magique did there can help, that is - changing the channel and restarting the Wifi router.