What linux enterprise development system ?

Graduate to prepare for interviews . I heard that a lot of companies do development using linux, mainly used Ubuntu or what system ?
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see personal habits and business requirements put !

some with some ubuntu and fedora redhat

I was ubuntu environment
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linux indirect contact person , usually with ubuntu relatively easy to use, easy to install the software or something .

For seeking stable , centos also used more and more, but are generally used on the server. Individuals do not use .
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fourth year . .
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servers are generally RedHat, but I've seen embedded Ubuntu majority.