Hey there, I totally get your frustration—losing that specific guide is such a bummer! I ran into the same issue with my Logitech Craft on Ubuntu a couple of years ago and saved the command-line steps from that now-gone Ask Ubuntu thread. Here's exactly what worked for me:

• First, make sure your Bluetooth service is up and running. Check its status with:
  sudo systemctl status bluetooth
  If it's not active, start it using:
  sudo systemctl start bluetooth

• Launch the Bluetooth command-line tool:
  bluetoothctl

• Inside the interactive bluetoothctl session, turn on device scanning to find your Craft keyboard:
  scan on
  You’ll see a list of nearby Bluetooth devices—look for the entry labeled something like Logitech Craft and note down its MAC address (it’ll look like AA:BB:CC:DD:EE:FF).

• Stop the scan once you’ve got the MAC:
  scan off

• Pair with the keyboard (replace the example MAC with your actual one):
  pair AA:BB:CC:DD:EE:FF
  Pro tip: Before running this, hold down the Bluetooth pairing key on your Craft (usually near the F1-F4 keys, marked with a Bluetooth icon) until the indicator light starts flashing—this puts the keyboard into pairing mode.

• Once pairing succeeds, mark the device as trusted so it auto-connects on boot:
  trust AA:BB:CC:DD:EE:FF

• Finally, connect to the keyboard:
  connect AA:BB:CC:DD:EE:FF

If you run into issues (like pairing failing), try restarting the Bluetooth service with sudo systemctl restart bluetooth and repeating the steps, or double-check that the keyboard is still in pairing mode when you run the pair command.

备注：内容来源于stack exchange，提问作者Gamood