middlewared.service_exception.CallError: [EFAULT] Cannot remove file /tmp

Trying to update TrueNAS Core from TrueNAS-13.0-U5.3 to TrueNAS-13.0-U6.1, so that I can then migrate to TrueNAS Scale. It fails every time. I have not been able to find a fix.

Error: Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 355, in run
    await self.future
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 391, in __run_body
    rv = await self.method(*([self] + args))
  File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 981, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update.py", line 389, in file
    await self.middleware.call('update.install_manual_impl', job, destfile, dest_extracted)
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1279, in call
    return await self._call(
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1247, in _call
    return await self.run_in_executor(prepared_call.executor, methodobj, *prepared_call.args)
  File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1152, in run_in_executor
    return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
  File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update_/install_freebsd.py", line 72, in install_manual_impl
    if self.install_impl(job, dest_extracted) is None:
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update_/install_freebsd.py", line 39, in install_impl
    return self.middleware.call_sync('update.install_impl_job', job.id, location).wait_sync(raise_error=True)
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 326, in wait_sync
    raise CallError(self.error)
middlewared.service_exception.CallError: [EFAULT] Cannot remove file /tmp

Any ideas would be great.