wireless not working,cannot download bcmwl-kernel-source

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http://askubuntu.com – new to ubuntu,I have a wireless issue with my HP netbook,I am using ubuntu 12.10.I found a fix here Ubuntu 12.10, Wireless not working but when I type sudo apt-get install --reinstall bcmwl-kernel-source it prompts that bcmwl-kernel-source could not be downloaded!Any suggestions?I m trying for this wireless issue some days now and I cannot fix it,please help,cause I m new to linux,and OSystems in generally and there seems to be a problem with it.(command lspci -nn gives the number 14e4:4727 for the controller,so that's why I thought this fix above would help) (HowTos)