Your server doesn’t meet the following requirements to run Craft Here's the error I get: "You have an insecure version of crypt installed. Please update PHP to 5.3.7 or later". I have PHP Version 5.3.2 installed on my Ubuntu server and cannot switch to a new version no matter what I do. I also tried to php5enmod mcrypt and it gives me command not found. I did the classic 

sudo apt-get update;
sudo apt-get install php5;
sudo apt-get install php5-mcrypt;

Can you guys help? My phpinfo() doesnt show mcrypt as being installed even though it is installed actually. I am out of ideas
I would install PHP via a third-party repository. I use Ondřej Surý's and I'm pretty happy with it. It installs PHP 5.5.

https://launchpad.net/~ondrej/+archive/ubuntu/php5