Public bug reported:

We have a bit of a problem right now with LXD in Ubuntu 20.04.

Users upgrading from 18.04 to 20.04 or those installing LXD through the
deb shim, will correctly detect that they are on a LTS and auto-select a
LTS branch of LXD (defaults to 4.0).

That's however not the case for the images we publish which all default
to "latest" and so currently pull in LXD 4.1 and soon 4.2.


This isn't good as the behavior we're aiming for is that LTS users should get 
an LTS track of LXD (4.0) and non-LTS users should get the latest track.


To fix this, we need to be able to specify a track/channel/branch alongside the 
snap we want to seed and have livecd-rootfs pull that.

For LXD that would mean "lxd 4.0/stable/ubuntu-20.04" in focal and "lxd
latest/stable/ubuntu-20.10" on groovy. The exact syntax doesn't matter
and it's probably fair to assume that the ubuntu branch will exist so
won't need specifying.


We would like this issue sorted in time for Ubuntu 20.04.1 so we have a good 
consistent story for those upgrading and those deploying new systems at that 
time.

** Affects: cloud-images
     Importance: Undecided
         Status: New

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: cloud-images
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1882374

Title:
  Support inclusion of snap from specific track/channel/branch

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