$ python --version
Python 3.8.10
$ pip install ipython
$ ipython
Traceback (most recent call last):
  File "/path/to/venv/bin/ipython", line 8, in <module>
    sys.exit(start_ipython())
  File "/path/to/venv/lib/python3.8/site-packages/IPython/__init__.py", line 123, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/path/to/venv/lib/python3.8/site-packages/traitlets/config/application.py", line 845, in launch_instance
    app.initialize(argv)
  File "/path/to/venv/lib/python3.8/site-packages/traitlets/config/application.py", line 88, in inner
    return method(app, *args, **kwargs)
  File "/path/to/venv/lib/python3.8/site-packages/IPython/terminal/ipapp.py", line 279, in initialize
    self.init_shell()
  File "/path/to/venv/lib/python3.8/site-packages/IPython/terminal/ipapp.py", line 293, in init_shell
    self.shell = self.interactive_shell_class.instance(parent=self,
  File "/path/to/venv/lib/python3.8/site-packages/traitlets/config/configurable.py", line 540, in instance
    inst = cls(*args, **kwargs)
  File "/path/to/venv/lib/python3.8/site-packages/IPython/terminal/interactiveshell.py", line 619, in __init__
    super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
  File "/path/to/venv/lib/python3.8/site-packages/IPython/core/interactiveshell.py", line 529, in __init__
    self.init_virtualenv()
  File "/path/to/venv/lib/python3.8/site-packages/IPython/core/interactiveshell.py", line 788, in init_virtualenv
    new_path = p.readlink()
AttributeError: 'PosixPath' object has no attribute 'readlink'

If you suspect this is an IPython 8.1.0 bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@python.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    c.Application.verbose_crash=True