I migrated a site from windows xampp to ubuntu. It was working fine. But once I cleared the cache, the browser is showing blank screen.I tried going to different urls . I also tried clean urls but nothing is coming. All I can see is a white/blank browser.
The White Screen of Death (Completely Blank Page) is a good starting point to takle down the problem.
For D7, extension=php_domxml.dll in php.ini must be commented out. With that dll enabled, I got a blank screen too in Windows.
Check with your php configuration in your linux server.