Ubuntu 4GB Ram Limitation and Solution

Option # 1: Use 64 bit Ubuntu Linux 64 bit Linux kernel will take care of 4G or more memory. Just grab latest 64 bit version and install it.

Option #2: Install PAE enabled kernel

Open terminal and type the following command:

sudo apt-get update 

sudo sudo apt-get install linux-headers-server linux-image-server linux-server 

sudo reboot

To check and verify increment of the memory by using following command.

free -m