mvn-debian: 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/mvn-debian - from package: maven-debian-helper

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

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