This morning, I can't connect to a network which was working perfectly yesterday. I've been through a lot of 'can't connect to a network' questions here but they all seem to be first time connections and are about setting up the network correctly, or the network adaptor.
I opened the laptop this morning and the connection to my normal network (the only one) was refused with 'Cannot find Network' The network said 'used yesterday at...' so it's definitely the same connection I used without error last night.
I tried removing it and re-instating it (checking the SSID and password on my router to be sure nothing had oddly changed), still no connection.
I tried using nmtui in a terminal (as a sudo user, if that makes any difference).It too said it couldn't find the network. I tried deleting and re-instating the network connection within nmtui, it still couldn't find the network.
I've three other devices on this network, so the network is working fine. I do have mac address filtering, but a) the device in question is listed correctly, and b) I turned it off just in case a tried but with no success.
Can anyone give me any clues as to where to look next?