qemuctl: 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/qemuctl - from package: qemuctl

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