Back up owncloud installation and owncloud data.

Disable contacts and calendar app from the web interface.

Download owncloud-8.0.0.tar.bz2.

Move old owncloud directory away and create new empty one.

Unpack that tarball into the new empty directory.

Get new calendar and contacts apps:

168707-calendar.zip
168708-contacts.zip

from:

Unpack the zips under apps.

# chown -R www-data.www-data /home/roger/WEB/oc/owncloud

Then use the command line tool to enable the apps (doesn’t work from the web UI - complains about missing info.xml).

# sudo -u www-data ./occ app:enable calendar
# sudo -u www-data ./occ app:enable contacts

Now it all seems to be working apart from enabling apps from the web UI.