First run - didn't upgrade MySQL database, started with empty DB (no content). Sources are visible and I can play back a file from NAS.
Second and subsequent runs: hangs on KODI splash screen, last entry in logs is:
21:46:14.026 T:4094607280 NOTICE: EGL_CLIENT_EXTENSIONS = NULL
21:46:14.027 T:4094607280 NOTICE: Checking resolution 16
21:46:14.460 T:4094607280 NOTICE: GL_VENDOR = ARM
21:46:14.460 T:4094607280 NOTICE: GL_RENDERER = Mali-450 MP
21:46:14.460 T:4094607280 NOTICE: GL_VERSION = OpenGL ES
21:46:15.947 T:3984585584 NOTICE: Running database version Addons27
21:46:15.951 T:3984585584 NOTICE: Running database version ViewModes6
21:46:17.352 T:3984585584 NOTICE: Running database version Textures13
21:46:17.576 T:3984585584 NOTICE: Running database version MyMusic72
21:46:17.830 T:3984585584 ERROR: SQL: [MyVideos116] The table does not exist
Query: SELECT idVersion FROM version
21:46:17.836 T:3984585584 ERROR: Process error processing job
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Odroid C2. The MyVideos116 database obviously exists on my MySQL server. MySQL Workbench shows no connection attempts by Kodi to the database server.
UPDATE & SOLUTION:
I realized Movies116 is the current version of the database. It was looking suspicious on the MySQL server (not all tables were there compared to the previous Movies113). Apparently the upgrade on the first restart didn't work properly.
So I simply dropped the (new) Movies116 database, asked Libreelec to systemctl restart kodi.service and this time the database upgrade went smoothly and I am back with all my content.
Also it might be of use for all Odroid C2 users to make an addendum in release notes in regards to the Linux kernel (Odroid C2 LE is still running 3.14.29 as it was earlier announced by the team).