BUG: pd.read_clipboard() not working in WSL2
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.

---
#### Code Sample, a copy-pastable example
```python
pd.read_clipboard()
```

#### Problem description
I recently started using WSL2 on Windows 10 Pro / Ubuntu 20.04 / Python 3.8.5.  In general, It works incredibly well today (unlike in 2018).  Unfortunately, pd.read_clipboard() and df.to_clipboard() don't work.  I believe the problem is pandas because I got the desired functionality to work using pyperclip directly.

#### Error Message
>>> pd.read_clipboard()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/mickeymouse/.local/lib/python3.8/site-packages/pandas/io/clipboards.py", line 38, in read_clipboard
    text = clipboard_get()
  File "/home/mickeymouse/.local/lib/python3.8/site-packages/pandas/io/clipboard/__init__.py", line 649, in lazy_load_stub_paste
    return paste()
  File "/home/mickeymouse/.local/lib/python3.8/site-packages/pandas/io/clipboard/__init__.py", line 287, in __call__
    raise PyperclipException(EXCEPT_MSG)
pandas.io.clipboard.PyperclipException:
    Pyperclip could not find a copy/paste mechanism for your system.
    For more information, please visit
    https://pyperclip.readthedocs.io/en/latest/introduction.html#not-implemented-error