Linux Packaging Changes — Flatpak and Portable Builds

Quick update on Linux support for Mythic GME Digital.

TL;DR

AppImage: Discontinued.
DEB/RPM: Discontinued.
Flatpak: Recommended packaged install on Linux going forward.
Portable Linux build: Still available through itch.io when provided for a release.

What’s changing

AppImage is dropped. Recent builds have been unreliable. v1.4.7 will remain available as a legacy option for a while, but new updates won’t target AppImage.
DEB and RPM are dropped. These formats often break across distro versions and take extra time to maintain.
Flatpak is the packaged install focus. It runs on Ubuntu/Debian, Fedora/openSUSE/RHEL, Arch, and SteamOS with fewer dependency issues.
Portable Linux builds may still be provided. These are not AppImages; they are direct portable builds for players who prefer the itch app or manual folders.

Steam

When the game lands on Steam, it’ll ship as a native Linux build. Steam will run it in their Linux runtime so it works cleanly on SteamOS/Deck.

If you’re new to Flatpak

Some distros already include Flatpak. On others (like Ubuntu), there’s a simple one-time setup. I’ll keep clear install steps on the game page.

Flatpak Install Guide (Linux)

Follow the steps for your distro, then install the .flatpak file (e.g., mythicgmedigital.flatpak).

Ubuntu 22.04 / 24.04 / Debian 12 / 11

sudo apt update 
sudo apt install -y flatpak 
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Arch Linux / Manjaro / EndeavourOS

sudo pacman -S --noconfirm flatpak 
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

openSUSE Leap / Tumbleweed

sudo zypper install -y flatpak 
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Fedora 40 / 41 / 42

sudo dnf install -y flatpak 
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

RHEL 9 / CentOS Stream 9 / Rocky 9 / AlmaLinux 9

sudo dnf install -y flatpak 
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Install the `.flatpak` file (all distros)

Assumes you downloaded mythicgmedigital.flatpak to your current folder. The filename may differ.

# Install for your user (recommended)
flatpak install --user ./mythicgmedigital.flatpak
# Flatpak will fetch the required runtime from Flathub if needed.

Run the app

# Option A: from your desktop menu (after install)
# Option B: from the terminal
# Find the app ID (replace "mythic" with part of the app's name if needed)
flatpak list --app | grep -i mythic
# Then run it (replace <APP_ID> with the exact ID shown above)
flatpak run <APP_ID>

Update / Uninstall (optional)

# Update all Flatpak apps and runtimes
flatpak update
# Uninstall the app (replace <APP_ID> as above)
flatpak uninstall <APP_ID>
# Remove unused runtimes
flatpak uninstall --unused

Quick checks (troubleshooting)

# Confirm Flatpak is installed
flatpak --version
# Confirm Flathub is added
flatpak remotes

Reference links

Flatpak setup per distro: https://flatpak.org/setup/
Installing applications: https://docs.flatpak.org/en/latest/using-flatpak.html#installing-applications
Flathub (app catalog): https://flathub.org/
Arch Wiki — Flatpak: https://wiki.archlinux.org/title/Flatpak
openSUSE — Flatpak portal: https://en.opensuse.org/Portal:Flatpak
Fedora — Flatpak setup: https://flathub.org/setup/Fedora
Linux Mint — Flatpak setup: https://flathub.org/setup/Linux%20Mint

I want your input

If you rely on .deb or .rpm, please reply with:

Your distro + version
Which format you use
Why Flatpak wouldn’t work for you

This shift should reduce weird breakages and let updates roll out faster. Thanks for all the Linux testing and feedback — keep it coming!