Launchpad builds for i386 fail: Command errors (if any): b''

[pachulo]

Since some days ago, the nextcloud snap, based on core18, is failing to build for i386 on launchapd.

This is what the log shows:

...
Restarting host AppArmor
Command output: b''
Command errors (if any): b''
2025-12-11T01:02:57Z INFO Waiting for automatic snapd restart...
snapd 2.60.4 from Canonical** installed
snap "snapd" has no updates available
error: cannot perform the following tasks:
- Ensure prerequisites for "snapcraft" are available (cannot install snap base "core18": snap "core18" assumes unsupported features: snapd2.61 (try to refresh snapd))
Install failed
...

We have configured the following source snap channels for automatic builds:

snapcraft	7.x/stable
snapd		latest/stable

Thanks for any help!

[jgneff]

I’m getting the same error on core20 with the latest/stable channels of snapcraft and snapd for all platforms (amd64, arm64, armhf, ppc64el, s390x). See the build logs of the OpenJDK snap for details.

[ogra]

@jgneff

I’m getting the same error on core20

For snaps with a core20 base this is expected (not so for core18 based snaps) …:

How to best handle i386 when moving a snap to 'base: core20'

Hi, Existing snaps that produce i386 builds are supportable for the lifetime of Ubuntu 16.04 LTS or Ubuntu 18.04 LTS when using the core or core18 snaps as the base. Publishers who want to move to ‘base: core20’ must drop builds for the i386 architecture since it isn’t unavailable. This presents a problem for publishers whose core/core18 builds are using the latest track and they want to move latest to core20. In my case, I wanted to continue to support i386 for the lifetime of Ubuntu 18.04 LT…

That said, I think core18’s standard support has ended in 2023 already (I do not think current snapcraft supports even building for core18 bases anymore) and users should generally consider to move forward …