Installing distro iso images

[Geoffrey Combes]

Recently I have downloaded Linus iso images and loaded them to storage 
disks. The first was lubuntu to a TF card to be used with an OrangePi 
One and the second, this week, ubuntu 17.04 to one of my desktop PC's 
HDDs. I used the standard terminal command for this loading procedure. 
For example, with the iso on the desktop the terminal command was: sudo 
dd bs=4M if=~/Desktop/ubuntu-17.04-desktop-i386.iso of=/dev/sdb1

My PC confirmed that the operating systems were properly installed on 
their respective storage media but neither would boot. For 17.04 my PC 
gave a reason for not booting, viz. "isolinux.bin is missing', which is 
not true as the file is in the iso. My question is: Have I left 
something out in the installing procedure? Or any other suggestions.

By the way, my reason for obtaining the 17.04 image was to replace 
16.04LTS which has developed a fault - both the Updating and Ubuntu 
Software apps have stopped working (a first time event for me).  This 
leaves me in a 'Catch 22' situation. As the 17.04 iso image won't boot I 
have ordered a 32-bit disk from Peter Baker using the on-line source 
ubuntu.net.au.

Geoffrey Combes