problem

After installing OMV (ver. 4.1.22), I intend to install some software with apt , and then I encounter the following error:

Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f81db3bc730>
Traceback (most recent call last):
  File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f81db3bc730>
Traceback (most recent call last):
  File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable

solution

After a search, Google found a solution on GitHub:

First open the /usr/lib/python3.5/weakref.py file:

vim /usr/lib/python3.5/weakref.py

Then change line 109 to

def remove(wr, selfref=ref(self), _atomic_removal=_remove_dead_weakref):

Line 117 should read

_atomic_removal(d, wr.key)

WQ save it, and then try apt , and the problem is solved