sudo : unable to resolve host name : temporary failure in name resolution - sudo engineer

There are two situations where you get the error named temporary failure in name resolution 1) which i showed in this video this is due to host name is different than virtual box name.(in this there is no problem of internet connection, means internet works fine here before and after doing this) 2) second error may be due to DNS server cannot resolve the domain names into their respective IP addresses ( in this there is no internet connection because DNS server cannot resolve the domain names) i will try to make video on second one, this video is about first one, I will add the link for second video on the pinned comment of this video ping me on instagram if you need any help :)