I just migrated an old Owncloud 9.1.7 to Nextcloud 10.0.6.
Seems to work fine, so afterwards i upgraded PHP to: PHP 7.0.27-1+ubuntu14.04.1+deb.sury.org+1 (cli) (built: Jan 11 2018 23:19:41) ( NTS ) with the instructions found here: https://www.digitalocean.com/community/tutorials/how-to-convert-an-owncloud-installation-to-nextcloud-on-ubuntu-14-04
However I still get an error message in the admin panel: “You are running PHP 5.5. To allow you to upgrade to Nextcloud 11 and higher you need to run at least PHP 5.6…”
I have restarted the apache server, tried changing the release channel back and forth, and restarted the whole server but no luck.
I did not set up this installation originally, so I don’t know too much about how the config, but AFAIK it’s a very standard Owncloud 9.1 setup (before the migration).