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When an update becomes available for a particular piece of software, if I run

aptitude changelog <name>  

I will see urgency as either low, medium or high.

How is it decided which category a fix falls into? And also, should I treat 'high' to mean 'install asap' and 'medium' to mean, 'install when convenient'?

Is there a best practice to follow on how soon high medium or low fixes should be implemented?

share|improve this question
According to this page, the urgency field isn't used by Ubuntu (at least the security side of it). – saiarcot895 Aug 5 '14 at 16:21

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