calcoo: 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/calcoo - from package: calcoo

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

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