What's the purpose of Linux's extrausers?

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Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?









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    Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?









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      Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?









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      Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?







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