Spyder doesn't start (after updating attempt)

Product Help Anaconda Navigator
1

Laptop with Linux Mint 20
Anaconda Navigator 2.4.0

In order to install Pandasgui package, I tried to update Spyder to 5.3.3 version, but with no results.

Now when I launch Spyder from Anaconda I get this error:

Traceback (most recent call last):
File "/home/xap/anaconda3/envs/Cazzaso3/bin/spyder", line 11, in 
sys.exit(main())
File "/home/xap/anaconda3/envs/Cazzaso3/lib/python3.8/site-packages/spyder/app/start.py", line 233, in main
from spyder.app import mainwindow
File "/home/xap/anaconda3/envs/Cazzaso3/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 57, in 
from qtpy import QtWebEngineWidgets # analysis:ignore
File "/home/xap/anaconda3/envs/Cazzaso3/lib/python3.8/site-packages/qtpy/QtWebEngineWidgets.py", line 29, in 
from PyQt5.QtWebEngineWidgets import QWebEnginePage
ImportError: /lib/x86_64-linux-gnu/libgssapi_krb5.so.2: undefined symbol: krb5_ser_context_init, version krb5_3_MIT

How can I solve this trouble?
Best regards
Beppe