### Bug Description Modern apt (unsure since when) supports inline `Signed-By`, which is the default way to add PPAs in mantic. However, when using LXD (at least for a core20 charm), this breaks snapcraft. WORKAROUND: use the (default) multipass backend. ### To Reproduce 1. Put the following file in `/etc/apt/sources.list.d/deadsnakes-ubuntu-ppa-mantic.sources` ``` Types: deb URIs: https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/ Suites: jammy Components: main Signed-By: -----BEGIN PGP PUBLIC KEY BLOCK----- . mQINBFl8fYEBEADQmGZ6pDrwY9iH9DVlwNwTOvOZ7q7lHXPl/TLfMs1tckMc/D9a hsdBN9VWtMmo+RySvhkIe8X15r65TFs2HE8ft6j2e/4K472pObM1hB+ajiU/wYX2 Syq7DBlNm6YMP5/SyQzRxqis4Ja1uUjW4Q5/Csdf5In8uMzXj5D1P7qOiP2aNa0E r3w6PXWRTuTihWZOsHv8npyVYDBRR6gEZbd3r86snI/7o8Bfmad3KjbxL7aOdNMw AqQFaNKl7Y+UJpv1CNFIf+twcOoC0se1SrsVJlAH9HNHM7XGQsPUwpNvQlcmvr+t 1vVS2m72lk3gyShDuJpi1TifGw+DoTqu54U0k+0sZm4pnQVeiizNkefU2UqOoGlt 4oiG9nIhSX04xRlGes3Ya0OjNI5b1xbcYoR+r0c3odI+UCw3VSZtKDX/xlH1o/82 b8ouXeE7LA1i4DvGNj4VSvoxv4ggIznxMf+PkWXWKwRGsbAAXF52rr4FUaeaKoIU DkJqHXAxrB3PQslZ+ZgBEukkQZF76NkqRqP1E7FXzZZMo2eEL7vtnhSzUlanOf42 ECBoWHVoZQaRFMNbGpqlg9aWedHGyetMStS3nH1sqanr+i4I8VR/UH+ilarPTW3T E0apWlsH8+N3IKbRx2wgrRZNoQEuyVtvyewDFYShJB3Zxt7VCy67vKAl1QARAQAB tBxMYXVuY2hwYWQgUFBBIGZvciBkZWFkc25ha2VziQI4BBMBAgAiBQJZfH2BAhsD BgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRC6aTI2anVXdvwhD/4oI3yckeKn 9aJNNTJsyw4ydMkIAOdG+jbZsYv/rN73UVQF1RA8HC71SDmbd0Nu80koBOX+USuL vvhoMIsARlD5dLx5f/zaQcYWJm/BtsMF/eZ4s1xsenwW6PpXd8FpaTn1qtg/8+O9 99R4uSetAhhyf1vSRb/8U0sgSQd38mpZZFq352UuVisXnmCThj621loQubYJ3lwU LSLs8wmgo4XIYH7UgdavV9dfplPh0M19RHQL3wTyQP2KRNRq1rG7/n1XzUwDyqY6 eMVhdVhvnxAGztvdFCySVzBRr/rCw6quhcYQwBqdqaXhz63np+4mlUNfd8Eu+Vas b/tbteF/pDu0yeFMpK4X09Cwn2kYYCpq4XujijW+iRWb4MO3G8LLi8oBAHP/k0CM /QvSRbbG8JDQkQDH37Efm8iE/EttJTixjKAIfyugmvEHfcrnxaMoBioa6h6McQrM vI8bJirxorJzOVF4kY7xXvMYwjzaDC8G0fTA8SzQRaShksR3USXZjz8vS6tZ+YNa mRHPoZ3Ua0bz4t2aCcu/fknVGsXcNBazNIK9WF2665Ut/b7lDbojXsUZ3PpuqOoe GQL9LRj7nmCI6ugoKkNp8ZXcGJ8BGw37Wep2ztyzDohXp6f/4mGgy2KYV9R4S8D5 yBDUU6BS7Su5nhQMStfdfr4FffLmnvFC9w== =7hFk -----END PGP PUBLIC KEY BLOCK----- ``` 2. Get a core20 snap (e.g. `git clone git@github.com:canonical/charmcraft.git`) 3. `snapcraft --use-lxd` ### Environment Kubuntu Mantic plus the sources file above (yes I know I shouldn't be pointing to a jammy source...) ### snapcraft.yaml ```shell N/A ``` ### Relevant log output ```shell $ snapcraft --verbose --use-lxd Starting Snapcraft 7.5.3 Logging execution to '/home/lengau/.local/state/snapcraft/log/snapcraft-20231018-125641.121134.log' Sorry, an error occurred in Snapcraft: E:Invalid value set for option Signed-By regarding source https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/ jammy (not a fingerprint), E:The list of sources could not be read. We would appreciate it if you anonymously reported this issue. No other data than the traceback and the version of snapcraft in use will be sent. Would you like to send this error data? (Yes/No/Always/View) [no]: n You can find the traceback in file '/tmp/tmp3m36qgt8/trace.txt'. trace: Traceback (most recent call last): File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/cli.py", line 255, in run _run_dispatcher(dispatcher, global_args) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/cli.py", line 228, in _run_dispatcher dispatcher.run() File "/snap/snapcraft/9726/lib/python3.8/site-packages/craft_cli/dispatcher.py", line 448, in run return self._loaded_command.run(self._parsed_command_args) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/commands/lifecycle.py", line 265, in run super().run(parsed_args) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/commands/lifecycle.py", line 138, in run parts_lifecycle.run(self.name, parsed_args) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/parts/lifecycle.py", line 179, in run yaml_data = process_yaml(snap_project.project_file) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/parts/lifecycle.py", line 142, in process_yaml yaml_data = yaml_utils.load(yaml_file) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft/parts/yaml_utils.py", line 94, in load raise errors.LegacyFallback(f"base is {build_base}") snapcraft.errors.LegacyFallback: base is core20 During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/cli/legacy.py", line 27, in legacy_run run() File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 1130, in __call__ return self.main(*args, **kwargs) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 1055, in main rv = self.invoke(ctx) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 1635, in invoke rv = super().invoke(ctx) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 1404, in invoke return ctx.invoke(self.callback, **ctx.params) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 760, in invoke return __callback(*args, **kwargs) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/decorators.py", line 26, in new_func return f(get_current_context(), *args, **kwargs) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/cli/_runner.py", line 139, in run snap_command.invoke(ctx) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 1404, in invoke return ctx.invoke(self.callback, **ctx.params) File "/snap/snapcraft/9726/lib/python3.8/site-packages/click/core.py", line 760, in invoke return __callback(*args, **kwargs) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/cli/lifecycle.py", line 405, in snap _execute(steps.PRIME, parts=tuple(), pack_project=True, output=output, **kwargs) File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/cli/lifecycle.py", line 141, in _execute build_provider_class.ensure_provider() File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/internal/build_providers/_lxd/_lxd.py", line 90, in ensure_provider if repo.Repo.is_package_installed("lxd") or repo.Repo.is_package_installed( File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/internal/repo/_deb.py", line 535, in is_package_installed with AptCache() as apt_cache: File "/snap/snapcraft/9726/lib/python3.8/site-packages/snapcraft_legacy/internal/repo/apt_cache.py", line 58, in __enter__ self.cache = apt.Cache() File "/snap/snapcraft/9726/lib/python3.8/site-packages/apt/cache.py", line 170, in __init__ self.open(progress) File "/snap/snapcraft/9726/lib/python3.8/site-packages/apt/cache.py", line 232, in open self._cache = apt_pkg.Cache(progress) apt_pkg.Error: E:Invalid value set for option Signed-By regarding source https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/ jammy (not a fingerprint), E:The list of sources could not be read. ``` ### Additional context This will probably be fixed with the core22 move, but it's strange that snapcraft would be checking the repositories on the host at all (unless in destructive mode).