GEAR LEVER

You remove the gear knob by pulling it straight up. BUT — be sure to hold far down (B), not on the leather section (A).

Error: B sliding down.
Remove the gear knob and take the black plastic piece out of B, glue it in place again, and put on B.

The drawing is borrowed from the Citroën C6' service manual

Error: The gear lever is stuck at P.
Remove the cover and insert a long screw driver as shown here.