Hi!
Thanks so much for letting us know about this, it's a really important piece of info!
A lot of the testing was also done on a pretty weak laptop (albeit one running WIN10), and that's how most of the lowest graphical settings got implemented, but I haven't encountered outright instant crashes yet, hmm.
For now, a potential temporary solution I could suggest for the WIN version would be to try going to 'Users\[username]\AppData\Roaming\Godot\app_userdata\XxU', opening preferences.cfg, and changing the 'slideshow_enabled' parameter in the [graphics] section to true.
I'll run this by the team so we can check potential issues with the Linux version and look into more stable fixes^^