service_starting: 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:

/lib/rc/bin/service_starting - from package: openrc

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

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