phototonic: 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/phototonic - from package: phototonic

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

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