Sorry that I couldn't find a better title for this thread. For past couple of days I'm getting this sort of roadblock pages before going to many sites.
The address of this page is shown something like ad.sg.doubleclick.net while loadind. Seeing Doubleclick I thought it might be a spyware. So I scanned but found nothing. I also get this sort of pages while browsing in Ubuntu. I think my PC is not infected. Any idea how to get rid of them? Maybe the DNS servers I use has something to do with this problem? I use 126.96.36.199 , 188.8.131.52 , 184.108.40.206 .
BTW, I only get ads from shaadi.com. I don't know how they found me as a potential client.