Unable to open or create the local sync database

[orbalt]

For Windows client I recommend checking this thread:

Unable to sync Documents or Pictures folders from Desktop Client (Windows 10)

Nextcloud version: 18.0.3 Operating System and version: Ubuntu 16.04 LTS x64 Apache version: Apache 2.4.18 PHP version: 7.2.29 Client version: 2.6.4 stable - Win64 build 20200303 Client OS: Windows 10 x64 1903 Issue: After installing the Windows client and setting up sync, some folders sync and others fail with a specific error: Unable to open or create the local sync database. Make sure you have write access in the sync folder. Folders that sync: Desktop Downloads Photos Folders w…