I had a similiar problem when updating from unofficial LineageOS 15.1 to the official build. There was a permission problem with some apps (aparrently some settings were lost, and PrivacyGuard also lost some granted permissions). As a result, most of the apps I had installed crashed.
Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10076 nor current process has android.permission.ACCESS_NETWORK_STATE
Reinstalling the problematic apps solved the problem for me (no need to delete data/cache).
Edit: I just started over, some system apps crashed as well.