habe die befehle eingeben und dann den rechner neugestartet. wlan funktioniert immer noch nicht 
das kam bei der kontrolle raus:
user@acer:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
user@acer:~$ lsmod
Module Size Used by
parport_pc 36959 0
ppdev 17113 0
snd_hda_codec_hdmi 28167 4
binfmt_misc 17565 1
snd_hda_codec_realtek 336771 1
rfcomm 47694 8
snd_hda_intel 33211 2
snd_hda_codec 103804 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13604 1 snd_hda_codec
snd_pcm 96391 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi 13324 0
sco 18187 2
snd_rawmidi 30486 1 snd_seq_midi
bnep 18308 2
l2cap 53570 16 rfcomm,bnep
snd_seq_midi_event 14899 1 snd_seq_midi
snd_seq 61621 2 snd_seq_midi,snd_seq_midi_event
sparse_keymap 13898 0
snd_timer 29602 2 snd_pcm,snd_seq
snd_seq_device 14462 3 snd_seq_midi,snd_rawmidi,snd_seq
btusb 18600 2
nvidia 10709116 45
bluetooth 72320 9 rfcomm,sco,bnep,l2cap,btusb
joydev 17606 0
snd 67382 14 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
uvcvideo 72195 0
videodev 82052 1 uvcvideo
v4l2_compat_ioctl32 17078 1 videodev
psmouse 73535 0
intel_ips 18097 0
serio_raw 13166 0
soundcore 12680 1 snd
snd_page_alloc 18529 2 snd_hda_intel,snd_pcm
video 19438 0
lp 17825 0
parport 46458 3 parport_pc,ppdev,lp
usbhid 46956 0
hid 91020 1 usbhid
ahci 25951 2
tg3 141750 0
libahci 26642 1 ahci
user@acer:~$ dmesg | egrep 'brcm|wl|wmi'
[ 1.829343] wmi: Mapper loaded
[ 22.901516] acer-wmi: Acer Laptop ACPI-WMI Extras
[ 22.915223] acer-wmi: Unable to detect available WMID devices
user@acer:~$ sudo iwlist scan
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.