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Pop!_OS .iso file (we download this, and put it on the USB stick, and use that to install the Operating System on the new PC) https://pop.system76.com/
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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holoiso
Discontinued SteamOS 3 (Holo) archiso configuration [Moved to: https://github.com/HoloISO/holoiso] (by theVakhovskeIsTaken)
No to discount your work and this tutorial (in fact very much appreciated), but you could just use holoISO on that pc and turn it into a steam deck.
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There are some decent tweaks available through Decky Loader, but from what I gather, full third-party OS support is still waiting on Valve to release drivers.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.