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I have a Ubuntu 16.04 LTS installed on virtual box. I have configured a mail server on it. I have to be able to connect to this server from outside(from host, from another computer, etc). the virtual OS is connected via NAT. in network setting, I set it on bridged adaptor, but then I am unable to start virtual box because of this error: enter image description here enter image description here what should I do??

host OS: ubuntu 16.04 LTS

guest OS: ubuntu 16.04 LTS

virtual box version: Version 5.1.38_Ubuntu r122592

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