systemd services to automatically update user flatpaks each 6h (by default)

1. Create the updater service

1systemctl --user edit --full --force flatpak-user-update.service

1[Unit]
2Description=Flatpak Automatic Update
3Documentation=man:flatpak(1)
4Wants=network-online.target
5After=network-online.target
6
7[Service]
8Type=oneshot
9ExecStart=/usr/bin/flatpak --user update -y --noninteractive
10
11[Install]
12WantedBy=multi-user.target

1. Install a timer

1systemctl --user edit --full --force flatpak-user-update.timer

1[Unit]
2Description=Flatpak Automatic Update Trigger
3Documentation=man:flatpak(1)
4
5[Timer]
6OnBootSec=5m
7OnCalendar=0/6:00:00
8Persistent=true
9
10[Install]
11WantedBy=timers.target

1. Enable the timer

1systemctl --user daemon-reload
2systemctl --user enable --now flatpak-user-update.timer

Source