gpg2 does not detect smart card adapter

[Jan Suhr]

Hi!
I am using the OpenPGP Card with a "Gemplus GemPC Twin 00 00" smart card
adapter and it works fine with gnupg 1. But gnupg 2 does not find my
smart card adapter and tells me "OpenPGP Karte ist nicht vorhanden:
Umbekanntes IPC Kommando" (OpenPGP card ist not available: unknown IPC
command). My system is Ubuntu and I used its gnupg(1) and gnupg2 packages.

Also removing libccid and pcscd did not help.

Any idea how to fix it?