sadt: 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/sadt - from package: devscripts

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