Ubuntu Base images offer our smallest and lightest images with just the bare essentials to manage the board hardware and connect to networks. It uses systemd for most basic system services. The default user credentials are as follows:
Username: root
Password: root
It will prompt you to change the password after login for security reasons.
Image Layout
Board specific bootloader which not listed in partition table
FAT32 EFI partition 1 with GRUB (/boot/efi)
BTRFS root partition 2 (/)
Config…
There shouldn’t be any difference in terms of booting Linux portion. The USB problem could be a power issue or a compatibility issue with that specific keyboard.