tree: command not found

[lirel]

this package should suggest package "tree" to be installed.

/usr/sbin/alsa-info: line 661: tree: command not found

log:
$ sudo alsa-info
ALSA Information Script v 0.5.1
--------------------------------

This script visits the following commands/files to collect diagnostic
information about your ALSA installation and sound related hardware.

  dmesg
  lspci
  aplay
  amixer
  alsactl
  rpm, dpkg
  /proc/asound/
  /sys/class/sound/
  ~/.asoundrc (etc.)

See '/usr/sbin/alsa-info --help' for command line options.

/usr/sbin/alsa-info: line 661: tree: command not found
/usr/sbin/alsa-info: line 661: tree: command not found
/usr/sbin/alsa-info: line 661: tree: command not found
Automatically upload ALSA information to www.alsa-project.org? [y/N] : n

Your ALSA information is in /tmp/alsa-info.txt.nTN6DqVchT

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: alsa-utils 1.2.6-1ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 21 16:39:18 2022
InstallationDate: Installed on 2022-04-14 (7 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Beta amd64 (20220329.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-utils
UpgradeStatus: No upgrade log present (probably fresh install)