ANSWER
It was a bug.
https://blog.sombex.com/2017/12/fix-cant-connect-to-wifi-issue-in-debian-9-and-other-debian-based-linux.html
1. Open this file:
sudo gedit /etc/NetworkManager/NetworkManager.conf
2. add these 2 lines and save:
[device]
wifi.scan-rand-mac-address=no
3. Restart Network
It is indeed ath9K_htc.
I reinstalled the whole OS, and now the proper Wi-Fi network is already
listed. But after inputting the passphrase, I still can't access the network
via Wi-Fi.
I'll reinstall the linux-libre kernel now, and see how it goes.
Btw, for your linux-libre tutorial:
"gpg
Since you mention lsusb I wonder if you're talking of ath9k_htc and not
ath9k. ath9k_htc is a USB WiFi. If it's the USB WiFi one please check if the
package open-ath9k-htc-firmware is installed.
Nothing really :
most of my data was on an encrypted HDD.
The OS was on the SSD, along some configuration files and .org files (oh
well...).
So I picked an old HDD from an older machine which I was using as an external
drive, erased it and made a new install.
Ah, maybe this matters:
this
So what has changed between installations, apart from your changing the SSD?
Yes, personal, not pro.
And you have selected WPA & WPA2 Personal?
I checked them from another machine, all caps or not, etc.
I also have the document from my ISP where they're printed/written.
How did you "check both SSID and passphrase"?
Sorry, I'll clarify :
When I say I'm rebooting (by choice), it's only meaning that I tried this
option, since it solves issues sometimes.
When I say it's a working card, I mean it's recognized by lsusb, and it
worked up until now (my SSD died, I had to reinstall on a new disk).
My problem
You say you have a working WiFi card, the kernel I compiled, the ath9k driver
(which which actually comes with the kernel) and you keep rebooting. But you
don't seem to say what your actual problem is. When you have this working
stuff (since you said you have a working WiFi), *why* are you
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