After short struggling wifi is now working well. I have used ndiswrapper and Dell driver (use service tag to find it). For me it was ftp://ftp.us.dell.com/network/R242906.exe. Open the downloaded file using file-roller (archive manager) and extract bcmwl4.inf and bcmwl5.sys.
After installing ndiswrapper packages following commands installed the card:
ndiswrapper -i bcmwl5.inf
ndiswrapper -m
ndiswrapper -l
The last command shall say something similar to:
bcmwl5 : driver installed
device (14E4:4328) present (alternate driver: ssb)
Now add line ndiswrapper to /etc/modules and a line
blacklist ssbinto /etc/modprobe.d/blacklist.conf.
Try modprobe ndiswrapper now and see whether NetworkManager will detect wifi networks in the range .
