l have just installed Ubuntu 12.04 on my machine when l started firefox for the first time on typing google.com l redirected to random websites
l have also tried conneting the computer to a differnt router same problem
Also the same laptop is running Windows 7 with no such issues.
Another thing l have just noticed is it only happens when l type google.com if l type www.google.com the redirection does not occur.
And this is only happening on FireFox l have installed Chrome works with no issues.