Because the server where maas is installed does not have an internet connection, I have to download each snap file at https://api.snapcraft.io/api/v1/snaps/download/. Then, I installed with the command "snap install --dangerous *.snap" each file
Because the server where maas is installed does not have an internet connection, I have to download each snap file at https:/ /api.snapcraft. io/api/ v1/snaps/ download/.
Then, I installed with the command "snap install --dangerous *.snap" each file