Версия 16 уже даже не поддерживается: Go directly to the latest maintenance release of: Nextcloud 19 Nextcloud 18 Nextcloud 17 Nextcloud 16 (unsupported!) https://nextcloud.com/changelog/
Nextcloud Hub 20 debuts Dashboard, unifies search and notifications, integrates with other technologies https://nextcloud.com/blog/nextcloud-hub-20-debuts-dashboard-unifies-search-and-notifications-integrates-with-other-technologies/
nextcloud-20.0.0-alt1 -> sisyphus: Thu Oct 15 2020 Evgeniy Korneechev <ekorneechev@altlinux> 20.0.0-alt1 - version 20.0.0 / Oct 3 2020 (closes: #39028) - Add requirement to php7-intl (closes: #36902)