ontoget: 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/ontoget - from package: emboss

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