dispcalGUI-3DLUT-maker: command not found

Have You tried accessing the binary with the full path?

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/dispcalGUI-3DLUT-maker - from package: dispcalgui

You may install the required package with command apt-get install {package}
Error in other languages:
dispcalGUI-3DLUT-maker: bevel nie gevind nie
dispcalGUI-3DLUT-maker: comandă negăsită
dispcalGUI-3DLUT-maker: comando não encontrado
dispcalGUI-3DLUT-maker: commande introuvable
dispcalGUI-3DLUT-maker: command not found
dispcalGUI-3DLUT-maker: käsku ei ole
dispcalGUI-3DLUT-maker: không tìm thấy lệnh
dispcalGUI-3DLUT-maker: komanda nerasta
dispcalGUI-3DLUT-maker: Kommando nicht gefunden.
dispcalGUI-3DLUT-maker: kommandot finns inte
dispcalGUI-3DLUT-maker: komut yok
dispcalGUI-3DLUT-maker: nie znaleziono polecenia
dispcalGUI-3DLUT-maker: níor aimsíodh an t-ordú
dispcalGUI-3DLUT-maker: no se encontró la orden
dispcalGUI-3DLUT-maker: no s'ha trobat l'ordre
dispcalGUI-3DLUT-maker: opdracht niet gevonden
dispcalGUI-3DLUT-maker: parancs nem található
dispcalGUI-3DLUT-maker: perintah tidak ditemukan
dispcalGUI-3DLUT-maker: príkaz nenájdený
dispcalGUI-3DLUT-maker: příkaz nenalezen
dispcalGUI-3DLUT-maker: команда не найдена
dispcalGUI-3DLUT-maker: командата не е открита
dispcalGUI-3DLUT-maker: 命令找不到
dispcalGUI-3DLUT-maker: コマンドが見つかりません