schubmult: 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/bin/schubmult - from package: lrcalc

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

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