sagemath : sage test fail

edit

I got the following error while running the sage -t command.

$ sage -t test.py
Traceback (most recent call last):
  File "/usr/share/sagemath/bin/sage-runtests", line 178, in <module>
    DC = DocTestController(options, args)
  File "/usr/lib/python3/dist-packages/sage/doctest/control.py", line 358, 
in __init__
    for pkg in list_packages('optional', local=True).values():
  File "/usr/lib/python3/dist-packages/sage/misc/package.py", line 236, in 
list_packages
    for p in os.listdir(SAGE_PKGS):
FileNotFoundError: [Errno 2] No such file or directory: 
'/usr/share/sagemath/build/pkgs'

I attached the following information about the version:

Distributor ID: Ubuntu
Description:    Ubuntu 20.04.3 LTS
Release:    20.04

Python 3.8.10

$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 9.0, Release Date: 2020-01-01                     │
│ Using Python 3.8.10. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: