Cannot install additional apps in Nextcloud
Originally from here: https://forum.turris.cz/t/nextcloud-app-store-missing/13734
After installation of Nextcloud, no additional apps can be installed (their list is empty). It is probably caused by the bug reported here and fixed in Nextcloud 18.0.8.
This issue would be resolved by bumping the Nextcloud version to 18.0.8.