Launchpad builds failing with "cannot install snap base "core20""

snapcraft
1

Since two days ago, most of nextcloud’s launchpad builds are failing; the only one that built correctly was the i386 one.

The errors for the others look like this:

...
Processing triggers for libc-bin (2.27-3ubuntu1.6) ...
Running '['linux64', 'snap', 'install', '--classic', '--channel=7.x/stable', 'snapcraft']'. Attempt 1
error: cannot perform the following tasks:
- Ensure prerequisites for "snapcraft" are available (cannot install snap base "core20": snap "core20" assumes unsupported features: snapd2.61 (try to refresh snapd))
Running '['linux64', 'snap', 'install', '--classic', '--channel=7.x/stable', 'snapcraft']'. Attempt 2
error: cannot perform the following tasks:
- Ensure prerequisites for "snapcraft" are available (cannot install snap base "core20": snap "core20" assumes unsupported features: snapd2.61 (try to refresh snapd))
Running '['linux64', 'snap', 'install', '--classic', '--channel=7.x/stable', 'snapcraft']'. Attempt 3
error: cannot perform the following tasks:
- Ensure prerequisites for "snapcraft" are available (cannot install snap base "core20": snap "core20" assumes unsupported features: snapd2.61 (try to refresh snapd))
Install failed
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/lpbuildd/target/build_snap.py", line 295, in run
    self.install()
  File "/usr/lib/python3/dist-packages/lpbuildd/target/build_snap.py", line 161, in install
    self.backend.run(
  File "/usr/lib/python3/dist-packages/lpbuildd/target/lxd.py", line 776, in run
    raise e
  File "/usr/lib/python3/dist-packages/lpbuildd/target/lxd.py", line 770, in run
    return self._run_command(
           ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lpbuildd/target/lxd.py", line 699, in _run_command
    subprocess.check_call(cmd, **kwargs)
  File "/usr/lib/python3.12/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['lxc', 'exec', 'lp-bionic-amd64', '--', 'linux64', 'snap', 'install', '--classic', '--channel=7.x/stable', 'snapcraft']' returned non-zero exit status 1.
Revoking proxy token...

What’s going on?

Thanks!

2

This is stopping us from releasing stable versions for nextcloud. Can somebody offer some help?

Thanks!

3

Hello,

This seems to be a problem in the launchpad builders, looks like they need a newer snapd in order to install latest core20. I requested assistance to the launchpad devs. Will keep you posted on any progress.

Regards

1 Like
5

Hello,

A brief update, sadly we don’t have a solution yet. This is caused by core20 requiring a newer snapd, but there is no such snapd for the the builders as they are running on bionic yet. The release can be workaround by building the snap locally and uploading it to the store, we will continue investigating how to get a proper fix deployed on the builder.

Regards

1 Like
6

Thanks for the update!

Out of curiosity: do yo have any idea why this is working for i386 then?

7

In my tests on an Ubuntu 18.04 container, I solved it by doing a sudo snap install snapd before installing the snapcraft snap, but I don’t know if that would be a proper solution for the builders.

8

OK, found a workaround: configuring latest/stable as the channel for the snapd snap here:

image
image1130×462 65.5 KB

Everything works as intended.

1 Like