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https://documentation.ubuntu.com/core/tutorials/build-your-first-image/create-a-model/
Create a model - Ubuntu Core documentation
Create a model assertion for Ubuntu Core images. Download and customize model files with your selected snaps.
model ubuntu corecreatedocumentation
https://documentation.ubuntu.com/core/reference/assertions/model/
model - Ubuntu Core documentation
Model assertion reference. Defines device specifications including kernel snap, gadget snap, and base snap.
model ubuntu coredocumentation
https://documentation.ubuntu.com/core/tutorials/build-your-first-image/sign-the-model/
Sign the model - Ubuntu Core documentation
Sign your Ubuntu Core model assertion with GPG keys to create verifiable model files linked to your account.
model ubuntu coresigndocumentation