Automated Steam & FEX installer for Ubuntu on arm64

How to use

• In desktop mode right click and select the "Open in Terminal" option.
• If you have not already done so, run the following command on the new terminal window: wget https://raw.githubusercontent.com/MitchellAugustin/fex_autoinstall/refs/heads/main/fex_autoinstall_poc.sh && bash fex_autoinstall_poc.sh
• Once installation has completed and for all subsequent runs, Steam can be started by running steam normally.

This does the following

• Installs FEX PPA and dependencies
• Downloads and installs steam deb
• Enables thunking for graphics libraries
• Applies apparmor profiles for FEXBash and Steam
• Installs the necessary x86 libraries to have DLSS function
• Patches the Steam launcher to launch with FEXBash on arm64

Notes

• This is designed for Ubuntu 24.04 and may require modifications for use on other distros/releases
• This is third-party software for experimental use. It is not supported by Canonical, Valve, NVIDIA, or the FEX developers. Use at your own risk.
• Your x86 RootFS will not receive automatic updates.
• Clicking the launcher from the desktop icon will not work. It will produce the following error: "You are missing the following 32-bit libraries, and Steam may not run: libc.so.6"
• Once the fex_autoinstall_poc.sh script has been run it does not need to be run again. If it is run a second time FEXRootFSFetcher will prompt if the operation should be canceled or if the existing rootfs should be overwritten or validated. Any of these options will leave the rootfs in a functional state. Just select one and let the script complete normally.

Ubuntu_24_04.sqsh already exists. What do you want to do?
Options:
	0: Cancel
	1: Overwrite
	2: Validate

• It is recommended to run applications with Proton 10. This can be done by right clicking the game in steam and selecting "Properties". Then click on the "Force the use of a specific Steam Play compatibility tool" box and select Proton 10 from the drop down menu.

Before using this script

• Ensure that your host's graphics drivers are up-to-date

Troubleshooting

• If you experience any future crashes in games that were initially playable, update your RootFS by using FEXRootFSFetcher.
• If Steam fails to launch with an "exec format error", "You are missing the following 32-bit libraries, and Steam may not run: libc.so.6", or similar, ensure that patch_steam_for_arm64.patch has been correctly applied to your /usr/lib/steam/bin_steam.sh. (If the patch does not apply, you can launch with FEXBash steam instead.)