Workaround for installation (edit: Now Complete):
Disclaimers:
This configuration will automatically wipe your hard drive and install SteamOS as soon as it's finished booting. Don't use on a real computer unless you're REALLY sure.
I take no responsibility if you break your machine following these instructions!
I'm not going to "support" this installation method, it's very much a "Works for me" situation, YMMV.
These instructions assume your USB pen drive is on D: - Adjust where relevant
Step 1: Download syslinux from Here
Step 2: Download the following two Grub packages* and place them in D:\grub (you may need to create it)
Step 2: Extract the SteamOSInstaller.zip file to the root of your USB drive
Step 3: In the root of your USB drive, create a new folder called syslinux
Step 4: From the downloaded syslinux zip file, extract bios/win32 and bios/mbr into D:\syslinux\
Step 4: Open a Command Prompt as Administrator and run MAKE SURE YOU CORRECT THE DRIVE LETTER!:
d:\syslinux\win32\syslinux.exe --install --mbr --active d:
Step 5: Create the file D:\syslinux.cfg and put in the following:
DEFAULT linux TIMEOUT 50 LABEL linux kernel install.amd/vmlinuz append initrd=install.amd/gtk/initrd.gz preseed/file=/cdrom/default.preseed DEBCONF_DEBUG=developer desktop=steamos auto=true priority=critical video=vesa:ywrap,mtrr vga=788 -- quiet
Step 6: Insert the USB drive into the target machine and boot, the installer should run.
Step 7: The installer will FAIL when attempting to install grub, as grub-pc is missing, hold Ctrl+Alt and Hit F2 to drop into a shell, hit Enter to activate it.
Step 8: Type the following and when prompted, do not select any drives, just hit OK and then 'Yes':
chroot /target /bin/bash apt-get install grub-common grub2-common dpkg -i /media/cdrom/grub/grub-pc-bin_1.99-27+deb7u1+steamos3+bsos1_amd64.deb dpkg -i /media/cdrom/grub/grub-pc_1.99-27+deb7u1+steamos3+bsos1_amd64.deb
Step 9: Once that's complete, Hold Ctrl+Alt then hit F5 to return to the UI
Step 10: Hit 'Continue' to try grub again, this time it should run properly, say 'Yes' to installing to the MBR and the installation will complete.
Step 11: Once installation is complete, follow the rest of the guide Here
* Note that the grub packages are hosted by me, they are simply the standard debian builds with the DEBIAN/control file edited to repair dependency problems, and re-versioned to reflect their SteamOS usefulness.
-- VirtualBox Users --
To boot from USB, download this, extract plpbt.iso and boot from that, it'll allow a USB boot. Note that 'Enable USB 2.0 (EHCI) Controller' must be DISABLED.
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