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I have a web server running on Ubuntu 12.4. It is connected to Internet through WLAN interface, earlier it was connected and working perfectly and listed as wlan0 under network interfaces. I removed the WLAN card and inserted a USB WLAN adapter but it was not listed under interfaces nor it was detected after rebooting. So I removed that and installed my previous WLAN card. Now I can't see even that. How can I make ubuntu detect the previously installed WLAN card?

I also have an Ethernet card installed, it was not detected from the very beginning, but the WLAN card card was detected during installation, it only went missing after removing and reconnecting.

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