How do I install the cura-slicer snap

As said in the title, I'm having a little trouble installing the cura-slicer snap.
I did: sudo snap install cura-slicer
but it came up with this:

If anyone knows what this means and how to help, I would be very grateful!

Welcome, I tested it on UM 20.04

sudo snap install gtk-common-themes 
sudo snap install cura-slicer

cura-slicer 4.8.0 from Stefan Glasenhardt (glasen) installed.

Snapcraft was having some issues yesterday, please try again now that it is fully operational.