On Debian 9 (Stretch), snap can be installed directly from the command line:
$ sudo apt update $ sudo apt install snapd
If the sudo command isn’t installed (usually because a root password was provided at install time), you can install snap by first switching to the root account:
$ su root $ apt update $ apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To test your system, install the hello-world snap and make sure it runs correctly:
$ snap install hello-world hello-world 6.3 from Canonical✓ installed $ hello-world Hello World!
Snap is now installed and ready to go! If you’re using a desktop, a great next step is to install the Snap Store app.
Snap is currently unavailable on versions of Debian prior to 9.