[Bug 1788040] [NEW] Replace LXD deb by snap in Ubuntu 18.10

[Stéphane Graber]

Public bug reported:

Starting with Ubuntu 18.10, LXD will only be distributed as a snap.

Existing users will need to be migrated on upgrade and all reverse
dependencies be made aware of the snap.

For those reverse dependencies, make sure that you either:
 - Use the "lxc" and "lxd" commands WITHOUT hardcoding any paths (as they'll now be under /snap/bin/)
 - Use the API and known to look for BOTH /var/lib/lxd/unix.socket and /var/snap/lxd/common/lxd/unix.socket

The "lxd" deb will remain around, so it's fine to still
suggest/recommend/depend on it as that'll just install the snap as
needed.

** Affects: adapt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: autopkgtest (Ubuntu)
     Importance: Undecided
         Status: New

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

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

** Affects: snapcraft (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: autopkgtest (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: snapcraft (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: adapt (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: nova-compute-lxd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1788040

Title:
  Replace LXD deb by snap in Ubuntu 18.10

Status in adapt package in Ubuntu:
  New
Status in autopkgtest package in Ubuntu:
  New
Status in lxd package in Ubuntu:
  New
Status in nova-compute-lxd package in Ubuntu:
  New
Status in snapcraft package in Ubuntu:
  New

Bug description:
  Starting with Ubuntu 18.10, LXD will only be distributed as a snap.

  Existing users will need to be migrated on upgrade and all reverse
  dependencies be made aware of the snap.

  For those reverse dependencies, make sure that you either:
   - Use the "lxc" and "lxd" commands WITHOUT hardcoding any paths (as they'll now be under /snap/bin/)
   - Use the API and known to look for BOTH /var/lib/lxd/unix.socket and /var/snap/lxd/common/lxd/unix.socket

  The "lxd" deb will remain around, so it's fine to still
  suggest/recommend/depend on it as that'll just install the snap as
  needed.

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