ontoisobsolete: 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/ontoisobsolete - from package: emboss

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

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