Hi Edward,
if your dad has Winblows 10, maybe use Unetbootin for Windblows, your dad could overwrite the USB stick and then try downloading (yet) another ISO and do it himself?.
https://unetbootin.github.io/
If your dad isn't familiar with it, here is a guide for him!:
If unetbootin doesn't work for you, try "mintstick". You should (can) also install udisks2 in Ubuntu 15.10 and higher!:
http://pkgs.org/search/mintstick
http://pkgs.org/download/udisks2
Firstly, download your preferred version of Ubuntu Mate OS, 32 or 64 Bit (if you are unsure, download the 32 Bit version) (Ubuntu/Debian/Voyager/PinguyOS etc) in the form of an ISO file, remember where you store the file!. (I am not talking about using the Unetbootin download function, I am talking about you d…
See also (for your dad if he isn't a Linux guru):
WARNING 1:
BACKUP ALL YOUR DATA BEFORE YOU START TO INSTALL IN CASE THINGS GO WRONG!. SAVE ALL YOUR IMPORTANT FILES AND FOLDERS TO EITHER AN EXTERNAL USB DRIVE AND/OR TO A 2ND HARD DRIVE ON YOUR PC. DO NOT SAVE ANYTHING ON THE SAME DRIVE YOU INTEND TO USE FOR LINUX UNLESS YOU UNDERSTAND/KNOW WHAT YOU ARE DOING!. ONCE YOU START PARTITIONING AND YOU COMMIT TO FORMATTING YOUR PARTITIONS, THERE IS NO GOING BACK!.
WARNING 2:
IF YOU HAVE A RECOVERY PARTITION AND HAVE NOT CREATED ANY RECOVERY DISKS FO…