Traceback (most recent call last):
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/controllers/install.py", line 281, in install
    await self.curtin_install(
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquitycore/context.py", line 148, in decorated_async
    return await meth(self, **kw)
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/controllers/install.py", line 249, in curtin_install
    await self.run_curtin_install_step(
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquitycore/context.py", line 148, in decorated_async
    return await meth(self, **kw)
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/controllers/install.py", line 187, in run_curtin_install_step
    return await run_curtin_command(
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/curtin.py", line 203, in run_curtin_command
    return await cmd.wait()
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/curtin.py", line 116, in wait
    result = await self.runner.wait(self.proc)
  File "/snap/subiquity/4380/lib/python3.8/site-packages/subiquity/server/runner.py", line 84, in wait
    raise subprocess.CalledProcessError(proc.returncode, proc.args)
subprocess.CalledProcessError: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2494', '--setenv', 'PATH=/snap/subiquity/4380/bin:/snap/subiquity/4380/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/4380/bin:/snap/subiquity/4380/sbin', '--setenv', 'PYTHONPATH=:/snap/subiquity/4380/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/4380/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/4380', '--', '/snap/subiquity/4380/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2494.7"}}', '-c', '/var/log/installer/curtin-install/subiquity-curthooks.conf', 'install', 'cp:///tmp/tmpcr126a5a/mount', '--set', 'json:stages=["curthooks"]']' returned non-zero exit status 3.