mk-origtargz: 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/mk-origtargz - from package: devscripts

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

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