Hi there! I see you installed the Session app via Flatpak on your ChromeOS device, but it keeps spinning and won’t open, with an error message about app/im.status.session/x86_64/master not installed. Let’s try to figure this out together.

To start, could you let me know how you installed the app? For example, did you run a Flatpak install command from the terminal, or did you use a graphical interface? Also, did the installation process complete without errors or did you see any messages during install?

Meanwhile, here are some initial steps to try based on the issue you described:

1. Verify Flatpak Installation and Remotes
Open the terminal and check that Flatpak is properly installed and that the Flathub repo or the repo for Session app is added:
<br> flatpak remotes<br>
Look for “flathub” or the remote repo for Session. If it’s missing, add it:
<br> flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo<br>

2. Reinstall the Session App Using Flatpak CLI
Sometimes, apps installed from manually downloaded files or incomplete manifests cause this. It’s best to install using the Flatpak command line:
<br> flatpak install flathub im.status.session<br>
Replace im.status.session with the exact app ID if different.

3. Run the App via Terminal
Try launching the app from the terminal to catch any runtime errors:
<br> flatpak run im.status.session<br>
This may show error details that help us narrow down the problem.

4. Check for Architecture Compatibility
Your error mentions x86_64. ChromeOS on some devices uses ARM architecture (aarch64). Confirm your Chromebook’s CPU architecture matches the app’s build. If there’s a mismatch, the app won’t run.

5. Update Flatpak and System
Run updates to be sure your Flatpak version and runtimes are current:
<br> flatpak update<br> sudo apt update && sudo apt upgrade -y<br>

If after these steps it still won't open, please share the output of the install and run commands, and any error messages you get. That will help me assist you further.

Are you comfortable running commands in the terminal? Or would you prefer graphical steps if available?