lv2ls: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/lv2ls - from package: lilv-utils

You may install the required package with command apt-get install {package}
Error in other languages:
lv2ls: bevel nie gevind nie
lv2ls: comandă negăsită
lv2ls: comando não encontrado
lv2ls: commande introuvable
lv2ls: command not found
lv2ls: käsku ei ole
lv2ls: không tìm thấy lệnh
lv2ls: komanda nerasta
lv2ls: Kommando nicht gefunden.
lv2ls: kommandot finns inte
lv2ls: komut yok
lv2ls: nie znaleziono polecenia
lv2ls: níor aimsíodh an t-ordú
lv2ls: no se encontró la orden
lv2ls: no s'ha trobat l'ordre
lv2ls: opdracht niet gevonden
lv2ls: parancs nem található
lv2ls: perintah tidak ditemukan
lv2ls: príkaz nenájdený
lv2ls: příkaz nenalezen
lv2ls: команда не найдена
lv2ls: командата не е открита
lv2ls: 命令找不到
lv2ls: コマンドが見つかりません