What is HoloISO?
[HoloISO] attempts to bring the Steam Deck's SteamOS Holo into a generic, installable format, and provide a close-to-official SteamOS experience. Main point of this project focuses in re-implementing proprietary (as in runs-only-on-deck) components that Steam client, OS itself, gamescope and user-created applications for Deck rely on. -https://github.com/theVakhovskeIsTaken/holoiso
- Log into the ProxMox web UI
- Select a storage from the left navigation pane to download the .iso to
- Select ISO Images in the left sub-navigation pane
- If running ProxMox 6, download HoloISO Download and upload it to the ProxMox ISO image library
- If on ProxMox 7, click Download from URL and paste the download URL from above > Click Query URL > Click Download
- Right click the ProxMox node name > Create VM
- Give the VM a unique ID and Name > Next
- On the OS tab, Select the HoloISO installation .iso file, leave the Type as Linux and the Version as 5.x - 2.6 Kernel > Next
- On the System tab, set the BIOS field to OVMF (UEFI), Check the Add EFI Disk checkbox, Uncheck the Pre-Enroll Keys checkbox, Machine field to q35 and the SCSI Controller to VirtIO SCSI > Next
- On the Hard Disk tab, set the Disk size to 16 GiB or more > Next
- On the CPU tab, set Cores to 2 or more and Type to host > Next
- On the Memory tab, set the Memory to 8192 or more (Must be at least 8 GB to reach the installer desktop environment) > Next
- Leave the defaults on the Network tab > Next
- Verify the summary and click Finish
- Select Hardware from the left sub-navigation menu
- A physical GPU passthrough is required to run SteamOS and games (A full tutorial can be found here)
- Passthrough a USB keyboard and mouse by clicking Add > USB Device > Select the USB device(s) or port(s) to pass to the VM
- Right click the HoloISO VM in the left navigation pane > Start
- Press Enter to select SteamOS installer
- Wait while the SteamOS installer initializes
- Once a desktop environment displays, double click the Install SteamOS icon
- When prompted, select Installation type #2 deck-experience > Click OK
- Select sda from the list of available disks > Click OK
- Select Erase entire drive > Click OK
- Click Yes to confirm the installation
- When prompted, enter and confirm a root password
- Enter a username and enter and confirm the user's password
- After the HoloISO install completes, click the Applications menu > Shutdown > Shutdown
- In the Proxmox web UI, select Hardware from the left sub-navigation menu > Double click the CD/DVD drive > Select Do not use any media > Click OK
- Right click the HoloISO VM in the left navigation pane > Start
- The initial boot will sit at Loading initial ramdisk... for a few moments, be patient
- Select a Language
- Select a Timezone
- Select Wired connection 1
- Wait while SteamOS downloads and installs updates
- The VM will reboot
- Log in with an existing Steam account
- Welcome to HoloISO / SteamOS 3 Holo
A full tutorial for passing a physical disk to a VM can be found here