I'm trying to connect to my wireless network at home after "trying" Ubuntu 12.04 desktop 64-bit from a USB flash drive (without installing). Is this even possible? I can connect to the Internet through my ethernet port just fine but wireless is not working. I have checked my BIOS settings and my wireless switches are enabled. I have a Dell Latitude D830. Any help would be appreciated since my hard drive just crashed and I ordered a new one but for now the only way to connect to the Internet is through Ubuntu, booted from a USB device.
You may need drivers, are called firmware in Linux lingo. Try connecting your laptop with Ethernet and using the Additional Drivers tool (just search it in the dash). It will most likely find a driver for your machine.
If not, you may want to visit the Ubuntu Wireless Troubleshooting Guide or even the site of the old Intel® PRO/Wireless 3945ABG Driver project.
This latter option may be quite difficult if you are not a power user (involving intricacies with the kernel and heavy use of the terminal), but may be tried as a last resort.