command-not-found crashed: unable to open database file

[TianKun]

抱歉，command-not-found 崩溃了！请在以下地址报告错误：
https://bugs.launchpad.net/command-not-found/+filebug
请在报告中包含以下信息：

command-not-found 版本：0.3
Python 版本：3.8.10 final 0
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
额外信息：

unable to open database file
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 23, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 90, in main
    cnf = CommandNotFound.CommandNotFound(options.data_dir)
  File "/usr/lib/python3/dist-packages/CommandNotFound/CommandNotFound.py", line 79, in __init__
    self.db = SqliteDatabase(dbpath)
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/db.py", line 12, in __init__
    self.con = sqlite3.connect(filename)
sqlite3.OperationalError: unable to open database file

[TianKun (newphp)]

I have fixed this problem with the following command.

sudo chmod o+r /var/lib/command-not-found/commands.db

The problem is caused by "UMASK 027" and "USERGROUPS_ENAB no" in /etc/login.defs, after apt dist-upgrade, the permission of /var/lib/command-not-found/commands.db was changed from 0644 to 0640