Question #76845 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/76845

Steven Susbauer proposed the following answer:
The above is mostly your solution. It doesn't appear any process is  
using this ram, but it is not showing up as free ram. This is due to  
caching and is good for peformance. This memory will be given to an  
application if the application needs it. The "free" memory is not the  
only way to measure it, as it is not very smart.

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