If you're a sucker like me and installed usbguard on a Ubuntu variant you may find that you will have access to none of your usb devices at all, because F you. The installer automatically sets up the daemon which has no rules so will just block all of your devices. Doing a basic apt remove usbguard may fail at 25%, because also F you.
My kernel is version 4.15.0-47-generic, not sure if this stopped working at some point or what.
sudo echo "allow id *:*" > /etc/usbguard/rules.conf
sudo sed -i 's/PresentDevicePolicy=apply-policy/PresentDevicePolicy=allow/' /etc/usbguard/usbguard-daemon.conf
sudo reboot
Reboot may hang at stopping usbguard, again, because F you. Power off or wait. You'll hopefully have access to your devices when your machine comes back up.
sudo systemctl stop usbguard.service
sudo systemctl disable usbguard.service
sudo systemctl stop usbguard-dbus.service
sudo systemctl disable usbguard-dbus.service
sudo apt remove usbguard -y
sudo apt purge usbguard -y
sudo rm -rf /etc/usbguard/
I had issues until I rebooted for whatever reason.
sudo reboot
Now you're free!
What if you can't access your system even through Safe Mode? That's what I'm dealing right now. I'm so mad and angry at whatever dumbass developer is responsible for this.
I am trying to boot via a USB and see if I can remove it from the filesystem somehow