全新安装 Debian buster 操作系统和软件包后：command-not-found
运行命令：
$ curl
Could not find the database of available applications, run update-command-not-found as root to fix this
Sorry, command-not-found has crashed! Please file a bug report at:
http://www.debian.org/Bugs/Reporting
Please include the following information with the report:
command-not-found version: 0.3
Python version: 3.7.3 final 0
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
Exception information:
local variable 'cnf' referenced before assignment
Traceback (most recent call last):
File "/usr/share/command-not-found/CommandNotFound/util.py", line 23, in crash_guard …