busctl: 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/busctl - from package: systemd

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