I updated initramfs and rebooted several times - no change.
Modules b43 and ssb are not loaded and wl not automatically. Could this be the 
cause for all the problems?

Under Hardware-driver I see that STA is successfully enabled, but no
wifi working.

Seems as if I cannot insert the module properly:

r...@ubuntu:/lib/modules/2.6.31-17-generic# find | grep wl.o
./updates/cw/iwlcore.ko
./kernel/drivers/net/wireless/iwlwifi/iwlcore.ko
r...@ubuntu:/lib/modules/2.6.31-17-generic# insmod 
./kernel/drivers/net/wireless/iwlwifi/iwlcore.ko 
insmod: error inserting './kernel/drivers/net/wireless/iwlwifi/iwlcore.ko': -1 
Unknown symbol in module
r...@kokoromi:/lib/modules/2.6.31-17-generic# insmod ./updates/cw/iwlcore.ko 
insmod: error inserting './updates/cw/iwlcore.ko': -1 Unknown symbol in module
r...@ubuntu:/lib/modules/2.6.31-17-generic# 

Log shows:
  390.350599] iwlcore: Unknown symbol __ieee80211_get_radio_led_name
[  390.351207] iwlcore: Unknown symbol ieee80211_wake_queue
[  390.351794] iwlcore: Unknown symbol ieee80211_get_tkip_key
[  390.352444] iwlcore: Unknown symbol __ieee80211_get_tx_led_name
[  390.353249] iwlcore: Unknown symbol ieee80211_find_sta
[  390.353871] iwlcore: Unknown symbol ieee80211_tx_status_irqsafe
[  390.355025] iwlcore: Unknown symbol __ieee80211_get_rx_led_name
[  390.355863] iwlcore: Unknown symbol ieee80211_stop_tx_ba_cb_irqsafe
[  390.357242] iwlcore: Unknown symbol ieee80211_wake_queues
[  390.358127] iwlcore: Unknown symbol ieee80211_stop_queue
[  390.358714] iwlcore: Unknown symbol ieee80211_stop_queues
[  390.359333] iwlcore: Unknown symbol __ieee80211_get_assoc_led_name
[  390.359968] iwlcore: Unknown symbol ieee80211_scan_completed
[  390.360808] iwlcore: Unknown symbol ieee80211_channel_to_frequency
[  390.362183] iwlcore: Unknown symbol ieee80211_hdrlen
[  390.362954] iwlcore: Unknown symbol ieee80211_beacon_get
[  390.363578] iwlcore: Unknown symbol ieee80211_frequency_to_channel
[  390.364180] iwlcore: Unknown symbol led_classdev_register
[  390.365185] iwlcore: Unknown symbol ieee80211_rx_irqsafe

The module is not blacklisted accidentally:
r...@ubuntu:/etc/modprobe.d# grep -i wl *
blacklist-bcm43.conf:# Warning: This file is autogenerated by 
bcmwl-kernel-source. All changes to this file will be lost.
blacklist-watchdog.conf:blacklist twl4030_wdt

-- 
[regression] no wlan on s10e broadcom since update to kernel 2.6.31-17
https://bugs.launchpad.net/bugs/504639
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