services-admin: 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/services-admin - from package: gnome-system-tools

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

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