[Bug 1871670] Re: cnf-update-db crashed with sqlite3.OperationalError in create(): database is locked

[Mark]

I guess I'm having the same bug, plaguing me since upgrading to 20.04.

I have a 100% reproducible
```
$ LC_ALL=en-US.UTF-8 blabla
Omlouváme se, command-not-found zhavaroval! Prosíme nahlaste chybu na:
https://bugs.launchpad.net/command-not-found/+filebug
K hlášení přidejte následující informace:

command-not-found verze: 0.3
Python verze: 3.8.2 final 0
Distributor ID: Ubuntu
Description:    Ubuntu 20.04 LTS
Release:        20.04
Codename:       focal
Informace o výjimce:

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
```

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https://bugs.launchpad.net/bugs/1871670

Title:
  cnf-update-db crashed with sqlite3.OperationalError in create():
  database is locked

Status in command-not-found package in Ubuntu:
  Confirmed

Bug description:
  After loading the 20.04 UBUNTU when i update this message is coming.

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: command-not-found 20.04.2
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu25
  Architecture: amd64
  CrashCounter: 1
  Date: Wed Apr  8 19:02:37 2020
  ExecutablePath: /usr/lib/cnf-update-db
  InstallationDate: Installed on 2020-04-08 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  InterpreterPath: /usr/bin/python3.8
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/lib/cnf-update-db
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=tr_TR.UTF-8
   SHELL=/bin/bash
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonArgs: ['/usr/lib/cnf-update-db']
  PythonDetails: N/A
  SourcePackage: command-not-found
  Title: cnf-update-db crashed with sqlite3.OperationalError in create(): database is locked
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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