I already tried turning them off under Settings > Notifications, with no avail. It still appears every 3 hours.
2 Answers
Solution
sudo snap stop --disable firmware-updater.firmware-notifier
Details
It seems these notifications are sent by Firmware Updater, which is a snap app. I tried stopping and disabling fwupd as Lefty suggested but it didn't work. The next time Firmware Updater runs, it will start fwupd and the notification will appear.
You could potentially mask fwupd so the service can't be started at all, but then I don't think Firmware Updater would work at all.
So apparently snap applications have their own services, and by running the command above it disabled the service responsible for these notifications:
$ snap services
Service Startup Current Notes
firmware-updater.firmware-notifier disabled inactive user,timer-activated
firmware-updater.firmware-updater-app enabled inactive user,dbus-activated
The best part is Firmware Updater still seems to work if I open it manually.
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If you're not interested in firmware updates, you can disable the whole firmware update service using:
sudo systemctl disable fwupd fwupd-refresh.timer
sudo systemctl stop fwupd
Note that you can still refresh firmware database or update firmware manually, eg. using fwupdtool.
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