[Bug 2104201] Re: LXD installer attempts to install when LXD snap is installed & disabled

[Simon Déziel]

@Wesley, on more recent versions, if you are in an interactive session,
you get a confirmation prompt:

```
$ lxc launch ubuntu-minimal-daily:25.04 c1
Launching c1
$ lxc shell c1              
root at c1:~# snap install lxd
root at c1:~# snap disable lxd
lxd disabled
root at c1:~# lxc ls
Would you like to install LXD snap now (Y/n)? y
Installing LXD snap, please be patient.
/usr/sbin/lxc: 49: exec: /snap/bin/lxd.lxc: not found
```

And then it fails due to the `snap install lxd` happening behind the
scene failing:

```
root at c1:~# journalctl -f
Mar 26 12:47:48 c1 lxd-installer-service[1972]: + snap install lxd --channel=5.21/stable/ubuntu-25.04
Mar 26 12:47:48 c1 snapd[741]: api_snaps.go:467: Installing snap "lxd" revision unset
Mar 26 12:47:48 c1 lxd-installer-service[1980]: snap "lxd" is already installed, see 'snap help refresh'
Mar 26 12:47:48 c1 lxd-installer-service[1972]: + break
Mar 26 12:47:48 c1 lxd-installer-service[1972]: + echo 1
```

Refreshing doesn't even work, it needs to be re-enabled:

```
root at c1:~# snap refresh lxd
error: cannot refresh "lxd": refreshing disabled snap "lxd" not supported
root at c1:~# snap list lxd
Name  Version         Rev    Tracking     Publisher   Notes
lxd   5.21.3-75def3c  32455  5.21/stable  canonical✓  disabled
root at c1:~# snap enable lxd
lxd enabled
```

However, I'm assuming that since you explicitly `snap disable lxd`, you
don't want lxd-installer to re-enable it?

I'm assuming you would like lxd-installer to be smarter at detecting
LXD's snap presence? If so, I'm thinking of adding an early exit on
`snap list lxd >/dev/null 2>&1` returning 0. WDYT?

-- 
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https://bugs.launchpad.net/bugs/2104201

Title:
  LXD installer attempts to install when LXD snap is installed &
  disabled

Status in lxd-installer package in Ubuntu:
  New

Bug description:
  Install and disable LXD in Ubuntu 24.04

  ```
  sudo snap install lxd
  sudo snap disable lxd
  ```

  Then run a command with lxc:

  ```
  $ lxc ls
  Installing LXD snap, please be patient.
  ```

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