nbdkit: command not found

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/sbin/nbdkit - from package: nbdkit

You may install the required package with command apt-get install {package}

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