I have a motherboard without fancy UEFI bios. This is what i’ve done to get it to work. This is basically a mashup of a few methods I’ve found on the internet so far. Credit goes to them and I will try to get better links & references to those where it is due.
Be on windows PC, have flash drive > 2GB
Download SteamOSInstaller.zip (the smaller one)
Extract to Desktop in SteamOS folder
Download the “two grub package files” from the reddit link
Make a folder in the SteamOS folder called ‘grub’ and copy the ‘two grub package files’ from the reddit link into this new folder
Download oscdimg.exe (from game cube world thread)
Open cmd prompt, cd to Downloads folder
Run This: oscdimg.exe -m -o -j2 -h -pEF -bC:\Users\XUSERNAMEX\Desktop\SteamOS\boot\grub\efi.img -lSteamOS C:\Users\XUSERNAMEX\Desktop\SteamOS\ SteamOS.iso
Plug in flash drive, make sure formatted in fat32
Open unetbootin and specify iso you just created and go
Place into desired machine. It will erase everything so be ready. Make sure to set bios to boot from flash drive.
unetbootin will load up, you’ll have lots of options, use ‘Untitled Entry grub0′
Install will start and go automatically
It will fail eventually when it can’t install grub
type the commands seen in the reddit post (chroot /target etc…)
you’ll have a prompt come up asking where to install grub, just install to all for now.
click continue and try to get past the grub failure.
a prompt will show and ask to install to MBR. yes you want to do this. let installer finish.
remove flash drive, reboot.
log in as ‘steam’ password ‘steam’
log in as ‘desktop’ password ‘desktop’
open up terminal, type ~/post_logon.sh
password is ‘desktop’
it will reboot and hopefully you’ll get into the steamOS
If you don’t want automatic partitioning, download this file and place it into the SteamOS directory before you create the ISO (Right click below and save as default.preseed)