Gyazemon - Headless Gyazo app for Ubuntu
Ubuntu Wayland also supported
"headless" means...
it does not have a screenshot-taking function
Instead, it watches directories and uploads media to Gyazo
Gyazo + daemon = gyazemon 
⚠This is an unofficial Gyazo app
Usage
/hakonamy/高機能なスクリーンショット＋自動でGyazoにアップロード(CleanShot X+Gyazemon)