Is that a Multiboot selection on startup?

[scorchplow]

Yes, that "Mobian" screen is likely a bootloader menu, which appears when multi-boot is enabled. If you only have one OS installed, you can usually skip the menu by configuring the bootloader to automatically boot the default OS. To do this, you can modify the bootloader settings or set the default OS in the bootloader's config file.

If you want to add another OS, you'd need to partition your storage for the second OS, then install it, ensuring both OSes are configured in the bootloader menu.

Let me know if you need more specific steps!