[wpa-supplicant] Can't connect to wifi hotspot

[Gilles]

Hello

I don't know much about wifi. I can't connect to my home AP from a Linux 
Mint 18 laptop that has a Qualcomm Atheros AR9285 wifi chip.

Here's what /var/log/syslog says when I try to connect to the AP using 
the NetworkManager in Mint:
https://pastebin.com/raw/ByfWKvqH
(used a remote site for a shorter message)

Does it look like the issue is with wpa_supplicant or rather in the 
NetworkManager application?

Thank you.