AVM FRITZ!Card USB v2.x

# install apps
apt-get install -y linux-restricted-modules linux-ubuntu-modules-$(uname -r) avm-fritz-firmware
modprobe capidrv
modprobe capi

# avm firmware
wget http://mirrors.kernel.org/ubuntu/pool/restricted/l/linux-meta/avm-fritz-firmware_2.6.24.24.26_amd64.deb -P /tmp

Ubuntu Gutsy fcusb2 kernel modules
fcusb2.tar.bz2

Links
http://wiki.ubuntuusers.de/Archiv/ISDN-Karten/AVM_FRITZ!Card_USB