New stable "core" and "ubuntu-core" snaps released

Oliver Grawert ogra at
Thu Jan 5 17:57:58 UTC 2017

Am Donnerstag, den 05.01.2017, 11:25 -0600 schrieb Leo Arias:
> Could you please explain what is ubuntu-core and core?
> In an old machine I have ubuntu-core, and I can't get core installed
> in there.

core/ubuntu-core is the execution environment in which your snaps run.

on a classic installation there are interfaces that give your snap
access to the outside world from the cage that ubuntu-core/core is.

on an actual ubuntu-core *image* interfaces can only be provided by
other snaps and core/ubuntu-core is your actual root filesystem (this
is why michael mentioned the reboot above).

initially this environment was called ubuntu-core, but with the cross
distro approach that seemed inappropriate so it was renamed to just be
called core.

if you try out a recent stable ubuntu-core image you will only find the
core snap installed. if you install your first snap on a classic system
you will also get the core snap installed now. on all installs that
pre-date the rename ubuntu-core was installed and is currently kept

recently all focus was on the core snap and ubuntu-core was a bit left
behind (never touch a running system when it is stable etc).
with todays update they are completely in sync with identical content

hope that clearifies some bits ... if not, keep asking ;)

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