Clean bluetooth cache command causes bluetooth errors on reboot

[ianchanning]

I'm on Ubuntu 22.04.

Running this command (from the Useful commands list)...

rm -r /var/lib/bluetooth/*

... prevents bluetooth from restarting after a reboot. All attempts to get the bluetooth service to start fail.

For example all suggestions in this question fail: https://askubuntu.com/questions/1403817/i-cant-turn-on-bluetooth-in-ubuntu-22-04-lts

The service status has a 226/NAMESPACE error message:

$ sudo systemctl status bluetooth.service
× bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Sun 2024-04-21 19:08:23 CEST; 2min 11s ago
       Docs: man:bluetoothd(8)
   Main PID: 9746 (code=exited, status=226/NAMESPACE)
        CPU: 12ms

Apr 21 19:08:23 bo-didley systemd[1]: bluetooth.service: Scheduled restart job, restart counter is at 5.
Apr 21 19:08:23 bo-didley systemd[1]: Stopped Bluetooth service.
Apr 21 19:08:23 bo-didley systemd[1]: bluetooth.service: Start request repeated too quickly.
Apr 21 19:08:23 bo-didley systemd[1]: bluetooth.service: Failed with result 'exit-code'.
Apr 21 19:08:23 bo-didley systemd[1]: Failed to start Bluetooth service.

Hunting for that error brings up this rather strange answer which suggests running:

sudo install -dm700 /var/lib/bluetooth

This fixes the problem (after a further reboot). If that is the correct command to re-instate the cache, could I suggest adding it to the readme?