Thanks for replying. As far as I know, Ubuntu worked fine on Unity from the beginning.
The modem that I am using is a wireless adsl2+ T&W matr-X 4ew, at least that is what it says
on the manual. Other than Wifi Radar, I also use Windows wireless drivers and Broadcam STA
wireless driver. I updated them when reinstalling 12.04.
The whole problem started about 2 weeks ago, when spring break began. Then I begaan getting different signals on my wifi. There are many hot spots here, and almost everybody has an iphone or ipad.
Also, in an attempt to upgrade to 13.04 everything crashed because wubi isn't supported by 13.04 and I had to reinstall again on wubi. I'd like to try 13.04 first from a usb stick, but mine is too small and I'm looking for one compatable with linux that I can use for this. I have tried various tweeks that I have read on different forums. Nothing works.
If it helps... my laptop is a Samsung RF711. It has NVIDA Optimus , intel core i5. originally with windows 7. (here the problem started ) which is why I want to make a clean install.
I can't understand why wifi works with Windows and not with Ubuntu. Especially since it worked before.
I hope that this is enough information.