nextcloud: update to version 19.0.3
After doing this update, it is required to reboot your router. Because then it couldn't find anything at IP/nextcloud. And once you do restart, it guides you to update it, and since then it works flawlessly.
Self sign-up has been disabled due to increased spam activity. If you want to get access, please send an email to a project owner (preferred) or at gitlab(at)nic(dot)cz. We apologize for the inconvenience.
After doing this update, it is required to reboot your router. Because then it couldn't find anything at IP/nextcloud. And once you do restart, it guides you to update it, and since then it works flawlessly.