aghermann: 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/aghermann - from package: aghermann

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