Sorry, i know i am a little late for migration to nextcloud - especially from such an old owncloud instance.
Please be keen.
I tried to follow this post:
(all installed via apt-get install owncloud)
(my config points to data dir: /vagrant/data/owncloud)
What i did:
;#most up-to-date version in point of writing
tar xvjf nextcloud-9.0.58.tar.bz2
cp -R owncloud/config nextcloud/config
cp -R owncloud/data nextcloud/data
chown -R www-data /var/www/nextcloud
php occ maintenance:install
But this installs nextcloud using a sqlite database - empty, no users, no files. All data is missing.
There was no "update" command available in command line tool occ.
It is not absolute clear to me, if i need to update owncloud 8.2.14 to owncloud 8.2.11 (released on Apr 18 2017; most up-to-date version in point of writing) prior to migrating to nextcloud.
Or did i miss another thing?