pkdumpimg: 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/pkdumpimg - from package: pktools

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

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