Note: ScreenKin currently uses the Truple app for Linux monitoring. While ScreenKin is developing its own dedicated apps, the Truple app provides the underlying technology for Linux devices. Follow the steps below to connect a Linux device to a ScreenKin account.

Note

This version of the monitoring app for Linux does not currently support blacking out banking websites. We strongly encourage the use of the image blurring feature to hide private information that may be captured.

Wayland vs X11 - Which Version Should I Use?

Linux uses a display server to show graphics on your screen. There are two main types: X11 (the older, traditional system) and Wayland (the newer system). Most modern Linux distributions are moving to Wayland by default.

To check which display server you're using:

Open a terminal and run:

echo $XDG_SESSION_TYPE

This will return either wayland or x11.

Which version of the monitoring app should I download?

• If the command returns wayland → Use the Beta version (Wayland support)
• If the command returns x11 → Use the Standard version

Wayland Support (Beta)

We now have a beta version of the app that supports Wayland! This version can be downloaded at linux.truple.io/beta/Truple.AppImage.

Important notes about the beta:

• This version does not rely on ImageMagick
• On some distros, it may cause a flash animation each time a screenshot is taken
• On Ubuntu, we've mitigated the flash animation by disabling animations before taking the screenshot, then re-enabling them immediately afterwards. This takes less than 1 second and should not be very noticeable.
• If you experience animation flickers, please report them to support@truple.io and we'll see if there's a way to work around it for your specific distro version.

Instructions

1. Standard version only: Download and install ImageMagick apt-get install imagemagick
2. Download and install libfuse2 sudo apt-get install libfuse2
3. Download Truple:

• Standard version (X11 only): linux.truple.io/prod/Truple.AppImage
• Beta version (Wayland support): linux.truple.io/beta/Truple.AppImage

4. Place Truple.AppImage into your user profile's home directory (~/)*
   mv ~/Downloads/Truple.AppImage ~/Truple.AppImage
5. Make the file executable
   chmod +x ~/Truple.AppImage
6. Launch the AppImage using the command below (or just double click on it)
   ~/./Truple.AppImage --no-sandbox &
7. Click Add device to account
8. Provide the ScreenKin account email address you wish to add your device to (the parent's account email) and a device name, then click Submit.
9. Your add device request was sent to the parent. They need to login to their ScreenKin parent dashboard and grant the request.
10. Once the request is granted, click "Check if granted" and the app will launch the monitoring service.
11. The parent can adjust the device's settings (image blurring, screenshot frequency, etc) from the ScreenKin parent dashboard

* The monitoring app is designed to run out of your Home directory. It may not launch properly or restart properly if moved. If you move the Truple.AppImage file, it will result in a tamper email being sent.

Supported Distros

There are a lot of different linux distros out there. We've designed the app to work with Ubuntu. Users have reported some tweaks needed in order to use it on other distros below. We cannot verify/guarantee the tweaks will result in everything working for your device.

• Fedora - Install x11-xserver-utils by running sudo dnf install x11-xserver-utils
• Ubuntu - Some users have reported needing to install imagemagick using the following command sudo apt install graphicsmagick-imagemagick-compat
• Debian - See https://trendoceans.com/how-to-enable-x11-and-disable-wayland-window-system/

Troubleshooting

Error: GLIBCXX_3.4.32 not found

The latest version uses updated GCC libraries. Some older versions of Ubuntu (< 24.04) and other linux distros may require an update to those libraries. Users have reported the following commands resolved this issue for them:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install --only-upgrade libstdc++6

Error: ERR_FAILED (-2) loading 'app://./index.html'

If you get the following error when you try to Launch the app (see log files), run the app using the --no-sandbox flag as indicated.

Error:

UnhandledRejection Error: ERR_FAILED (-2) loading 'app://./index.html

The fix is to run the app using the --no-sandbox flag as shown below:

 ~/./Truple.AppImage --no-sandbox &