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With a recent update to the Halo: The Master Chief Collection, Xbox Game Studios included the needed Easy Anti-Cheat file for Linux / Steam Deck to work online but they broke it in the process for some.

It's a very good sign that official support may come, as I pointed out on Twitter but I found that it stopped the game working entirely on both my Fedora Linux desktop and the Steam Deck. Looking around, I'm not alone in this issue. Even when trying to use the mode they included with the game to play without anti-cheat (so you can at least play offline), that doesn't work now either.

Thankfully, there is a temporary fix so you can continue playing offline until they sort it properly. Here's what you need to do (for Steam Deck, be in Desktop Mode):

  1. Right click on the game in your Steam Library.
  2. Go to Properties.
  3. Local files on the left tab.
  4. Click Browse.
  5. Find the "easyanticheat" folder, and inside remove "easyanticheat_x64.so" (or the whole folder, both ways work)

Now you will have it back as before, with the option to load without anti-cheat working once again.

Is this safe? Yes, as you'll be using the built-in option to play without it anyway. If you want to restore it, you can just Verify the files inside of Steam and it will grab them again.

Article taken from GamingOnLinux.com.
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I am the owner of GamingOnLinux. After discovering Linux back in the days of Mandrake in 2003, I constantly came back to check on the progress of Linux until Ubuntu appeared on the scene and it helped me to really love it. You can reach me easily by emailing GamingOnLinux directly. Find me on Mastodon.
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bravadomizzou Apr 20, 2022
How does one "Right click on the game in your Steam Library."? When I right click it in the Applications popup, no option shows up that says "Properties". You should also specify that you have to be in desktop mode.
Liam Dawe Apr 20, 2022
Quoting: bravadomizzouHow does one "Right click on the game in your Steam Library."? When I right click it in the Applications popup, no option shows up that says "Properties". You should also specify that you have to be in desktop mode.
It's right there in the text:
Quoting: The Article You Just Read(for Steam Deck, be in Desktop Mode):
mAdCraZyaJ Apr 21, 2022
Ever since you posted this article I have been returning at least 3 times a day wishing to see that EAC is now supported on the MCC 😂
m2mg2 Apr 23, 2022
Quoting: mAdCraZyaJEver since you posted this article I have been returning at least 3 times a day wishing to see that EAC is now supported on the MCC 😂

Me too. Unfortunately it doesn't seem to be happening.
mAdCraZyaJ Apr 23, 2022
Quoting: m2mg2
Quoting: mAdCraZyaJEver since you posted this article I have been returning at least 3 times a day wishing to see that EAC is now supported on the MCC 😂

Me too. Unfortunately it doesn't seem to be happening.

It will, just need faith in it. They clearly tried to deliver at least part of it but managed to do a classic 343 and not test the patch before publishing it and then causing a big headache. They’ll eventually sort it! I’m just hoping it’ll be ready before the summer bank holiday 😂
Pengling Apr 24, 2022
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Quoting: StarbellyDo I need to play the Marathon games in order to understand the plot of Halo?
Nah, you don't - it ended up as more of a spiritual follow-up after getting bought up, if I'm remembering right.
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