Using the 2.39.2 deb, building a classic snap without the core snap installed results in: Priming python3 Traceback (most recent call last): File "/usr/bin/snapcraft", line 9, in <module> load_entry_point('snapcraft==2.39.3', 'console_scripts', 'snapcraft')() File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 542, in load_entry_point return get_distribution(dist).load_entry_point(group, name) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2569, in load_entry_point return ep.load() File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2229, in load return self.resolve() File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2235, in resolve module = __import__(self.module_name, fromlist=['__name__'], level=0) File "/usr/lib/python3/dist-packages/snapcraft/cli/__main__.py", line 43, in <module> run(prog_name='snapcraft') File "/usr/lib/python3/dist-packages/click/core.py", line 716, in __call__ return self.main(*args, **kwargs) File "/usr/lib/python3/dist-packages/click/core.py", line 696, in main rv = self.invoke(ctx) File "/usr/lib/python3/dist-packages/click/core.py", line 1037, in invoke return Command.invoke(self, ctx) File "/usr/lib/python3/dist-packages/click/core.py", line 889, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke return callback(*args, **kwargs) File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/lib/python3/dist-packages/snapcraft/cli/_runner.py", line 72, in run ctx.forward(lifecyclecli.commands['snap']) File "/usr/lib/python3/dist-packages/click/core.py", line 552, in forward return self.invoke(cmd, **kwargs) File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke return callback(*args, **kwargs) File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 139, in snap project_options, directory=directory, output=output) File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_packer.py", line 46, in snap execute('prime', project_options) File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 79, in execute _Executor(config, project_options).run(step, part_names) File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 185, in run self._run_step(step, part, part_names) File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 222, in _run_step getattr(part, step)() File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/__init__.py", line 578, in prime elf_patcher.patch(elf_file=elf_file) File "/usr/lib/python3/dist-packages/snapcraft/internal/elf.py", line 392, in patch elf_file_path=elf_file.path) File "/usr/lib/python3/dist-packages/snapcraft/internal/elf.py", line 297, in wrapper return f(*args, **kwargs) File "/usr/lib/python3/dist-packages/snapcraft/internal/elf.py", line 407, in _run_patchelf subprocess.check_call(cmd) File "/usr/lib/python3.5/subprocess.py", line 576, in check_call retcode = call(*popenargs, **kwargs) File "/usr/lib/python3.5/subprocess.py", line 557, in call with Popen(*popenargs, **kwargs) as p: File "/usr/lib/python3.5/subprocess.py", line 947, in __init__ restore_signals, start_new_session) File "/usr/lib/python3.5/subprocess.py", line 1490, in _execute_child restore_signals, start_new_session, preexec_fn) TypeError: Can't convert 'NoneType' object to str implicitly This traces back to project_options.get_core_dynamic_linker() returning None in the pluginhandler.