I see this error message was also raised in: Cannot install "snapd": cannot install snapd snap on a model without a base snap yet
In case any of the detail asked for on that issue is needed here, I’ll include it.
pi@raspberrypi:~ $ snap list Name Version Rev Tracking Publisher Notes core18 20200707 1882 stable canonical✓ base gnome-3-28-1804 3.28.0-17-gde3d74c.de3d74c 129 stable canonical✓ - gtk-common-themes 0.1-36-gc75f853 1506 stable canonical✓ - scummvm 2.1.2 3996 stable snapcrafters -
pi@raspberrypi:~ $ snap changes ID Status Spawn Ready Summary 1 Done yesterday at 23:05 BST yesterday at 23:05 BST Initialize system state 2 Done today at 07:49 BST today at 07:56 BST Install “scummvm” snap 3 Done today at 07:49 BST today at 07:49 BST Initialize device 4 Done today at 07:56 BST today at 07:56 BST Running service command for snap “scummvm”
pi@raspberrypi:~ $ snap version snap 2.37.4-1+rpi1 snapd 2.37.4-1+rpi1 series 16 raspbian 10 kernel 5.4.51-v7l+