guestfsd: 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/sbin/guestfsd - from package: guestfsd

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

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