Quoting from http://blog.dustinkirkland.com/2015/01/snappy-vs-apt-get-ubuntu-matrix.html:
Q: I'm looking for the smallest possible Ubuntu image that still
supports apt-get... A: You want our Traditional Ubuntu Core. This is
often useful in building Docker and LXC containers.
Q: I'm building the next wearable IoT device/drone/robot, and perhaps
deploying a fleet of atomically updated micro-services to the cloud...
A: You want Snappy Ubuntu Core.
There seems to be two flavors of ubuntu... an "Ubuntu core" which supports apt-get and the snappy which doesnt.
Where can we download the "Traditional Ubuntu Core" from? Did it cease to exist and is now the same as the snappy?
Indeed, in the past Core and Snappy were two distinct OS flavors. If you dig through old releases, there's core images, but no snappy.
Dustin's blog dates to January 22, 2015. In this techcrunch article from December 9, 2014 the author refers to the two as distinct versions:
A few years ago, Ubuntu launched a minimalist “core” version of its
operating system for embedded systems. Today, it is launching an alpha
version of its new “snappy” edition of Ubuntu Core with transactional
updates that is specifically geared toward container farms, large
Docker deployments and platform-as-a-service environments
Since around mid-2015, Ubuntu Core ceased to exist and now "Snappy" and "Snappy Core" are used interchangeably.
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