Dell Inspiron 1545 Broadcom Wireless Drivers with Ubuntu Natty
If you can't connect with your Dell Inspiron 1545 on Ubuntu 11.04 beta 1 (Natty Narwhal), forget the threads such as http://ubuntuforums.org/showthread.php?t=1061710 unless you are planning on getting eye surgery very soon. (Don't get me wrong, it's very useful, but confusing and painful on a Friday night.)
Some background here: Every 6 months, I reinstall Ubuntu or upgrade from an existing version to the next on my dell inspiron 1545 laptop, and every time, I spend several hours troubleshooting my wireless card. (Always fun on Friday night!) As soon as it works, I just go on with my emails and various chores, forgetting to note whatever happened and how I -- or whoever -- fixed the issue. Too bad, in 6 months from now, I'm pretty sure I'll have to re-read the pile of posts about it all over again, and install packages that will ultimately make things worse before I find the solution... Well, let's try to make a short note this time.
sudo apt-get remove --purge bcmwl-sta-common bcmwl-kernel-source b43-fwcutter
After a reboot:
sudo apt-get install bcmwl bcmwl-sta-kernel-source b43-fwcutter
Open the "Additional Drivers" app:
If the Broadcom STA Wireless Driver Proprietary driver isn't enabled yet, please do so. Reboot and the wireless card should be enabled. If it doesn't work for you, please write a comment ... at: http://ubuntuforums.org/showthread.php?t=1061710