Problem with python-trio with s3ql

[Arcus]

on start s3ql

/usr/lib/python3/dist-packages/trio/_core/_multierror.py:468: RuntimeWarning: You seem to already have a custom sys.excepthook handler installed. I'll skip installing Trio's custom handler, but this means MultiErrors will not show full tracebacks.
  warnings.warn(

Using 2 upload threads.
Autodetected xxxx file descriptors available for cache entries
Detected Swift features for xxxx: copy via COPY, Bulk delete 1000 keys at a time, maximum meta value length is 255 bytes
Using cached metadata.
Setting cache size to 13195 MB
Loaded 0 entries from cache
ERROR: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/bin/mount.s3ql", line 33, in <module>
    sys.exit(load_entry_point('s3ql==3.7.0', 'console_scripts', 'mount.s3ql')())
  File "/usr/lib/s3ql/s3ql/mount.py", line 131, in main
    trio.run(main_async, options, stdout_log_handler)
  File "/usr/lib/python3/dist-packages/trio/_core/_run.py", line 1804, in run
    raise runner.main_task_outcome.error
  File "/usr/lib/s3ql/s3ql/mount.py", line 207, in main_async
    block_cache.init(options.threads)
  File "/usr/lib/s3ql/s3ql/block_cache.py", line 222, in init
    self.trio_token = trio.lowlevel.current_trio_token()
  File "/usr/lib/python3/dist-packages/trio/_deprecate.py", line 125, in __getattr__
    raise AttributeError(name)
AttributeError: lowlevel

[Arcus (estuaco)]

Solve the problem upgrading trio to lastest versio. Install pip and "pip install -U trio".

The problem is because ubuntu has a old version of trio.