If you are getting either of these errors
Unable to update "Snap Store": (null): cannot refresh "snap-store": snap "snap-store" has running apps (ubuntu-software)
or
Pending update of "snap-store" snap close the app to avoid disruptions (7 days left)
Then the snap-store process is running while you are trying to update it. The snap-store process will sometime start and run in the background even if the you didn't start it. I assume this is so it can check to see if anything needs updated. So to update the Snap Store we need to 'kill' it's process then run the update. Here's how:
Open a Terminal window and type the following:
sudo pkill snap-store && sudo snap refresh snap-store
If sudo pkill snap-store doesn't work then open the System Monitor and find the snap-store process and force end it. Then run sudo snap refresh snap-store .
