cantor: 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/cantor - from package: cantor

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

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