epm: 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/epm - from package: epm

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

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