How the ubuntu-core package can be updated without connection to the store?
Can I download the ubuntu-core package as *.snap file?
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Like any snap, you can directly download them unauthenticated from the store (this is what
sudo snap install ubuntu-core does). https://wiki.ubuntu.com/AppStore/Interfaces/ClickPackageIndex#Snap-specific_endpoints should be a start if you don't want to use the command line to get access to it. Come on #snappy on freenode, some store guy should be able to give you the exact details on how to retrieve those snaps.