Case: VirtualBox 6.1.16, host Solus Linux 4.1, guest Peppermint 10. After installing guest additions by inserting the iso into the guest and rebooting, the guest OS shows only a blank, black screen with cursor on top.
Case: VirtualBox 6.1 pass-through not working for Ubuntu guest on a Linux (SolusOS) host. Issue not limited to version or guest OS.
sudo-installed application needs to be run as local user upon startup AND/OR a shell script is required to be called upon startup.