Unable to Add Root Folder or Import Existing

Sonarr version (exact version): 3.0.4.1021
Mono version (if Sonarr is not running on Windows): 6.8.0.105
OS: Ubuntu 20.04.1 LTS
Debug logs: No logs are being created
Description of issue: Click on Add Root Folder, select folder, click OK and the Add window closes but nothing happens. No errors and no root folder added. Same behavior with Import Existing. When I click OK nothing happens.