Unable to install updates (null): cannot refresh "snap-store": snap "snap-store" has running apps (snap-store)

Unable to install updates
(null): cannot refresh "snap-store": snap "snap-store" has running apps (snap-store), pids:#####

Using Ubuntu Software to update Snap packages failed on Ubuntu 22.04.

To fix it run the following:

$: killall snap-store
$: snap refresh