reprepro: 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/reprepro - from package: reprepro

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

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