galculator: 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/galculator - from package: galculator

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

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