OnlyKey App unresponsive in Ubuntu 22.04

The OnlyKey App seems to hang (all buttons and fields unclickable) after opening and closing the ‘Choose File’ dialog. This makes it impossible to load firmware and restore from backup file.

OnlyKey v5.3.6
Ubuntu 22.04 LTS

Seems to be similar to this issue report in Github: Problems with gui not responding · Issue #198 · trustcrypto/OnlyKey-App · GitHub