mh_cleanpom: 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/mh_cleanpom - from package: maven-repo-helper

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

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