After fresh installing Debian buster OS and Package: command-not-found
$ 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 callback() File "/usr/lib/command-not-found", line 93, in main if not cnf.advise(args, options.ignore_installed) and not options.no_failure_msg: UnboundLocalError: local variable 'cnf' referenced before assignment
update-command-not-found as root does not fix the problem.
There is bug report, but seems no fix yet.