On Windows 7, if I turn off the wireless card, then turn off Windows 7, then boot Ubuntu, my wireless card won't work.
The proprietary drivers/software for your wireless card/laptop in Windows have a way of telling the wireless card to switch off. Unfortunately, it appears the open-source drivers in Ubuntu/Linux cannot.
The only solution is to not "turn off" the card before you shutdown Windows -- you don't need to do that anyway, it's not like the card will consume power once the laptop is shut down.
Apparently I have to keep turned on my wireless on windows 7 in order to work on ubuntu.... this is pretty disappointing
You can only use either Wubi-buntu OR Windows at any one time. I really don't understand what all the fuss is about.
What's the real solution?
Support wireless card manufacturers who provide proper Linux drivers or at least disclose enough information for the open-source community to write such drivers. Get a new mini-pcie wireless card; I recommend the Intel 6205/6230/6300 - works great with