I am following these instructions, and similarly this one.
I downloaded the BIOS update executable and put it into a USB drive, then after reboot I select BIOS update, where a GUI asks me to select the file. This is where I get stuck, as I cannot figure out how to select the file and continue:
Please see the attached Pics. I have used "Disks" in Ubuntu 18.04. things may be slightly different with your Ubuntu 17.10
Assumptions: System is UEFI Capable
Just copy downloaded exe file to /boot/efi/EFI/Dell/Bios and use this path during upgrade