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Hope that you've made a recent SQL dump PRIOR to updating to 8.3.0. Make absolutely sure that you have an SQL dump from an old version!!
Uninstall everything related to Openproject according to https://community.openproject.com/topics/10140
Make a new database
Re-import the SQL dump that ran on a previous openproject version mysql -u openproject -p openproject < openproject_v7.sql
Download version 8.2.1 from here: https://packager.io/gh/opf/openproject-ce
add it dpkg -i openproject_8.2.1-1550429392.328d0cc4.xenial_amd64.deb
Install openproject openproject configure
Install bundler gem install bundler:1.17.3
And its working again...
I find it frankly quite crappy that the new version (8.3.0) does not really support the old mysql databases anymore. At no point have we been informed that upgrading will make Openproject defunct. And no, migration to PostgreSQL did NOT work (at least not for wikis and work packages).