--- title: 'Solving the problem "Could Not Find Command-not-found database"' url: 'https://ra1ahq.blog/en/reshenie-problemy-could-not-find-command-not-found-database' markdown: 'https://ra1ahq.blog/en/reshenie-problemy-could-not-find-command-not-found-database.md' lang: en date: '2023-10-11' description: 'The "Command-not-found" stub program is triggered when a user mistakenly enters in the terminal a non-existent command name, such as "foobar". In some cases, the command-not-found program doesn''t work. How can I fix it? Introd' taxonomy: archives_month: - oct_2023 archives_year: - '2023' --- # Solving the problem "Could Not Find Command-not-found database" 11 October 2023 ![Solving the problem "Could Not Find Command-not-found database"](https://ra1ahq.blog/images/2/d/b/e/d/2dbed54d06b935c48fd6772cce5ba4811f886547-cnf-title.png)16:44 ### Solving the problem "Could Not Find Command-not-found database" 11 October 2023 16:44 The "Command-not-found" stub program is triggered when a user mistakenly enters in the terminal a non-existent command name, such as "foobar". In some cases, the command-not-found program doesn't work. How can I fix it? ### Introduction As you know, the programs are contained in packages, and the packages are managed by the **apt** command based on the contents of the file `/etc/apt/sources.list` and files \*.list in subfolder `sources.list.d`. When changing the composition of the repositories, the **"command-not-found"** program database, which is located along the path `/var/lib/command-not-found/`, should be automatically updated. The symptoms of the problem I have encountered are the following: 1\) When performing an incorrect command, a message is displayed `...

Could not find command-not-found database. Run 'sudo apt update' to populate it.

... : command not found` 2\) There is no database for the command, which is the fact: ``` ls -l /var/lib/command-not-found/ ``` 0 files ### Cause After the call of utility `apt-get update` worked out, a Bash script must run: **`/etc/apt/apt.conf.d/50command-not-found`**. Linux LXLE doesn't have such a file, but Linux Mint does. The LXLE developers forgot to include the file `50command-not-found`? ### Solution: Method No. 1 Copy the file `/etc/apt/apt.conf.d/50command-not-found` from Linux Mint to LXLE or create it manually. ![script](https://ra1ahq.blog/images/5/d/d/6/3/5dd6305301a8b34eddc74e59051500babff0c303-cnf.png "скрипт") The source text is 50command-not-found: [50command-not-found.zip](https://ra1ahq.blog/en/reshenie-problemy-could-not-find-command-not-found-database/50command-not-found.zip) After that, update the cache by calling **`apt update`**. It will also create SQLite database files for the **"command-not-found"** program in the `/var/lib/command-not-found/` directory. The files "commands.db" and "commans.db.metadata" are created by the Python script `/usr/lib/cnf-update-db`. (To do this, Python 2.7 or higher must be installed on the operating system - the condition in Linux LXLE is fulfilled). ### Solution: Method No. 2 Nach der Aktualisierung der Pakete **`apt update`** müssen Sie die folgenden 2 Befehle im Terminal manuell mit den Rechten von `sudo` ausführen: ``` sudo rm -f /var/lib/command-not-found/*.* sudo /usr/lib/cnf-update-db ``` ### Non-working solution (from the Internet) – can be suitable for other distributions Reinstalling the utility: sudo apt purge command-not-found sudo apt install command-not-found sudo apt update ### Testing Check the presence of files `commands.db` and `commands.db.metadata`: ``` ls -l /var/lib/command-not-found/ ``` ` Total 3156

-rw-r--r-- 1 root root 3223552 окт 11 15:53 commands.db

-rw-r--r-- 1 root root 3260 окт 11 15:53 commands.db.metadata

User@host:~$` Führen Sie den „falschen“ Befehl aus, zum Beispiel „Appt“: ``` appt ``` `The Appt command was not found. Perhaps you meant:

command 'ppt' from deb bsdgames (2.17-29)

command 'apt' from deb apt (2.4.10)

command 'aapt' from deb aapt (1:10.0.0+r36-3)

Try: sudo apt install ` Message *"Could not find command-not-found database. Run 'sudo apt update' to populate it."* it is no longer displayed.' That's fix. 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