[Bug 2061910] [NEW] lxd-installer should default to pulling LXD from the default channel

[Simon Déziel]

Public bug reported:

If `lxd-installer` cannot figure which LXD snap channel to use, it
currently defaults to pulling from `latest/stable`. `latest/stable` is a
moving target as new LXD versions are pushed to it on a monthly basis.
`lxd-installer`'s target audience are those casually running `lxc`
command without first evaluating which snap channel is better for them
based on the upstream doc:
https://documentation.ubuntu.com/lxd/en/latest/installing/#choose-your-
release

Since LXD doesn't allow downgrading, it is best to default to an LTS
version. That is why LXD upstream recently changed the default channel
to be the one pulling LXD 5.21 LTS.

** Affects: lxd-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2061910

Title:
  lxd-installer should default to pulling LXD from the default channel

Status in lxd-installer package in Ubuntu:
  New

Bug description:
  If `lxd-installer` cannot figure which LXD snap channel to use, it
  currently defaults to pulling from `latest/stable`. `latest/stable` is
  a moving target as new LXD versions are pushed to it on a monthly
  basis. `lxd-installer`'s target audience are those casually running
  `lxc` command without first evaluating which snap channel is better
  for them based on the upstream doc:
  https://documentation.ubuntu.com/lxd/en/latest/installing/#choose-
  your-release

  Since LXD doesn't allow downgrading, it is best to default to an LTS
  version. That is why LXD upstream recently changed the default channel
  to be the one pulling LXD 5.21 LTS.

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