I have an IdeaPad S10e running Ubuntu 12.04 for the past 6 months or so and was using the wireless network without any problems.

Recently, somebody accidentally switched off the Linksys EA4500 router. After it was turned on again, my Windows 7 computer had no problems reconnecting but the Ubuntu 12.04 system does not detect any available wireless network at all.

Can anybody offer any specific solutions?

Thanks in advance.