octanol: 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/octanol - from package: emboss

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

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