My problem is that when i started install ubuntu server in my server machine(Dell R540), it starts showing me the problem that "there was a problem completing the installation" and it restart with same language prompt again. so I detect the problem and it is not with my hardware machine but it is because of the ISO fie I downloaded from the ubuntu official website. I firstly downloaded the iso from here : https://releases.ubuntu.com/18.04/
https://i.stack.imgur.com/5VPo1.png
so this iso file is responding with "there was a problem completing the installation" after that I downloaded another ISO from here : http://cdimage.ubuntu.com/ubuntu/releases/18.04/release/
https://i.stack.imgur.com/pkuPS.png
It smoothly worked so the question is why these two are behaving differently.
