Install GTK Photo Ai Upscaler:
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Install (flathub):
flatpak install flathub io.gitlab.theevilskeleton.Upscaler

Uninstall (flathub):
flatpak remove flathub io.gitlab.theevilskeleton.Upscaler
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Build:
sudo apt install blueprint-compiler libgtk-4-dev libadwaitaqt-dev libadwaitaqt1 libadwaita-1-dev appstream-util python3-pip
sudo pip install vulkan --break-system-packages
git clone --recursive https://gitlab.com/TheEvilSkeleton/Upscaler
cd Upscaler
meson build
ninja -C build
sudo ninja -C build install

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Sources (2022/2023):
https://www.omgubuntu.co.uk/2022/11/upscaler-open-source-ai-image-upscale-app-for-linux
https://gitlab.com/TheEvilSkeleton/Upscaler
https://askubuntu.com/questions/1154986/valueerror-namespace-gtk-not-available
https://askubuntu.com/questions/1385690/how-to-satisfy-libadwaita-1-build-dependency-in-gnome-meson

Date in Vivaldi (Binary Install): November 20th 2022
Date (Build): February 7th 2023

Update 3 (Nov 14th 2025)
*Updates repository and other build instructions.

sources (2025):
https://branden-g.ca/Notes/Tech-Help/Linux-Repair/Linux-Apps-Setup/1-Install-Linux-apps-and-drivers/Python/Build%20&%20Install%20a%20'Python%20binding%20for%20Vulkan%20API'.txt
https://gitlab.gnome.org/World/Upscaler
https://tesk.page/upscaler/