Create Service

Create .service file in ~/.config/systemd/user

Eg:

[Unit]
Description=Linux Application Launcher
Documentation=https://ulauncher.io/
After=display-manager.service
 
[Service]
Type=simple
Restart=always
RestartSec=1
ExecStart=/usr/bin/ulauncher --hide-window
 
[Install]
WantedBy=default.target

Enable and start service

systemctl --user enable ulauncher.service
systemctl --user start ulauncher.service