cueconvert: 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/cueconvert - from package: cuetools

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

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