Traceback (most recent call last):
  File "/snap/hostname-desktop-installer/1197/usr/lib/python3.10/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/snap/hostname-desktop-installer/1197/bin/subiquity/subiquitycore/async_helpers.py", line 25, in _done
    fut.result()
  File "/snap/hostname-desktop-installer/1197/bin/subiquity/subiquity/server/controllers/filesystem.py", line 373, in _examine_systems
    system = await self._get_system(name, label)
  File "/snap/hostname-desktop-installer/1197/bin/subiquity/subiquity/server/controllers/filesystem.py", line 298, in _get_system
    await self._mount_systems_dir(variation_name)
  File "/snap/hostname-desktop-installer/1197/bin/subiquity/subiquity/server/controllers/filesystem.py", line 268, in _mount_systems_dir
    source_path = self._source_handler.setup()
  File "/snap/hostname-desktop-installer/1197/lib/python3.10/site-packages/curtin/commands/extract.py", line 122, in setup
    raise ValueError(
ValueError: Failed to use fsimage: '///cdrom/casper/minimal.standard.enhanced-secureboot.en.squashfs' doesn't exist or is invalid