Disable "latest" as upgrade option on focal
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| lxd (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
| Focal |
Fix Released
|
Undecided
|
Unassigned | ||
Bug Description
The "lxd" transitional deb-to-snap package currently offers "3.0", "4.0" and "latest" as track options with "4.0" being the recommended and default one.
Starting with LXD 5.0, it will no longer be possible to upgrade from LXD 3.0 without first going through LXD 4.0. As a result, the deb-to-snap logic in focal should be updated to remove "latest" as an option.
Instead users will have to pick between "3.0" or "4.0" and can then upgrade afterwards by switching snap track.
The impact from this should be minimal as most users have already gone through this process and those who haven't are likely to go with the default option anyway (4.0).
[Impact]
LXD 5.0 (to be released end of March) will break the upgrade path when coming from a release prior to 4.0.0.
The deb-to-snap logic in Ubuntu 20.04 currently offers "latest" as a track for users switching to the snap (from 3.0 deb). This option will start breaking once 5.0 is released and should be removed from the upgrader prior to that.
The users will lose the option to go straight to "latest" during the deb-to-snap process instead being pushed towards "4.0" which they can then upgrade from after the fact using "snap refresh".
The "4.0" track was already the default and used by virtually all users to date, so the change is unlikely to be particularly visible.
[Test plan]
Get an Ubuntu 18.04 system, run "lxd init --auto" to initialize LXD, then upgrade to 20.04 and confirm that the debconf prompt defaults to "4.0" and does not offer "latest" as a track option.
[Where problems could occur]
If this SRU isn't in focal-updates by the time LXD 5.0 releases to latest/stable (first week of April), some users may chose "latest" during the upgrade which will fail and fail the LTS-to-LTS process giving them a hard to recover system.
| Stéphane Graber (stgraber) wrote | #1 |
| description: | updated |
| Changed in lxd (Ubuntu): | |
| status: | New → Fix Committed |
| status: | Fix Committed → In Progress |
| Stéphane Graber (stgraber) wrote | #2 |
| Chris Halse Rogers (raof) wrote Proposed package upload rejected | #3 |
| Chris Halse Rogers (raof) wrote | #4 |
| Chris Halse Rogers (raof) wrote Please test proposed package | #5 |
| Changed in lxd (Ubuntu Focal): | |
| status: | New → Fix Committed |
| tags: | added: verification-needed verification-needed-focal |
| Stéphane Graber (stgraber) wrote | #6 |
| tags: |
added: verification-done-focal removed: verification-needed-focal |
| Launchpad Janitor (janitor) wrote | #7 |
| Changed in lxd (Ubuntu Focal): | |
| status: | Fix Committed → Fix Released |
| Stéphane Graber (stgraber) wrote Update Released | #8 |
| Changed in lxd (Ubuntu): | |
| status: | In Progress → Fix Released |
Note that I'm not pushing for an impish version of this change as this package in impish is unused.
The transitional "lxd" package is only relevant when upgrading from a pre-snap system which is only possible when upgrading from bionic to focal. The package has now been removed entirely from jammy, something we should have done a few releases ago.