[Bug] Error while patching Steam on Debian 13

[marcs-sus]

Before Reporting

• I found no existing issues matching my bug
• My issue is not caused by a theme
• My issue is not caused by a plugin

Describe the Bug

After running the following command as the website says

curl -fsSL "https://raw.githubusercontent.com/SteamClientHomebrew/Millennium/main/scripts/install.sh" | sudo sh

And then running sudo millennium patch, this error pops up

# sudo millennium patch
Resolving permissions...
Error: Steam start script not found. Ensure you're Steam installation is not flatpak, or snap.

To clarify, my Steam installation in Debian was done by following the official Debian wiki.
This article to be exact.
Summarizing, I enabled Multi-Arch with dpkg --add-architecture i386, installed steam-installer with apt, and installed Steam.

Expected Behavior

The patcher should be able to find the Steam run script normally.

Steps To Reproduce

1. On a stable Debian 13 "Trixie" operating system, with contrib and non-free added to the apt sources, like this

deb http://deb.debian.org/debian/ bookworm main contrib non-free

2. Run the commands to enable Multi-Arch, update the list of packages, and install steam-installer

dpkg --add-architecture i386
sudo apt update
sudo apt install steam-installer

3. Install additional libraries (amd64 system)

apt install mesa-vulkan-drivers libglx-mesa0:i386 mesa-vulkan-drivers:i386 libgl1-mesa-dri:i386

4. Run Millennium installation

curl -fsSL "https://raw.githubusercontent.com/SteamClientHomebrew/Millennium/main/scripts/install.sh" | sudo sh

5. Try to patch Steam

sudo millennium patch

Operating System

Linux

Anything else?

My humble guess => Something to do with this Steam installation on Debian 13, since (as far as I know), it differs from the installation on previous Debian versions, where you just installed Steam as a normal package.