I have a ubuntu system with 8.04 version installed & having memory of 512MB out of which only 100MB is been used for the processes but i am not able to see the rest of the memory it is showing me only 60MB free space so i guess it is a memory lekage problem so please help me how to fix this issue....
|>> Re: Not able to see the rest of the memory
Typically, Linux will show majority of your memory "used" - in reality, most of it is used by various caches and will be available to an application when necessary. As long as you are not using any on-disk swap space you are fine.
You can see a better break-down by "cat /proc/meminfo"