vdradmind: 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/vdradmind - from package: vdradmin-am

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