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Bug#966307: Hard to get command-not-found run; confusing error messages

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Package: command-not-found
Version: 18.04.5-1

We have a combination of sloppy and/or malicious programming here.
When run as non-root first, command-not-found complains that it's non-root. Why?
After the installation is over, there shouldn't be anything else to do as root.
Anyway, when run as root at first time, it complains about a bunch of other
things:

# command-not-found exiv2
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
callback()
File "/usr/bin/command-not-found", line 93, in main
if not cnf.advise(args[0], options.ignore_installed) and not
options.no_failure_msg:
UnboundLocalError: local variable 'cnf' referenced before assignment
#

When update-command-not-found is run, it does nothing (hangs up). No messages are
printed. If the command takes really long, some warning should get printed in
advance.
The next error ("Could not find the database") is likely to be an installation
error. After installation, there program command-not-found should really be
usable without any additional scripts run by anyone. The last error (reference
before assignment) is a programming error (see https://bugs.debian.org/965020).

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Bug#966307: Hard to get command-not-found run; confusing error messages "Md Ayquassar" <mdayq0@lenta.ru> - 2020-07-26 14:50 +0200

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