ewfdebug: 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/bin/ewfdebug - from package: ewf-tools

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

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