mpmetis: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/mpmetis - from package: metis

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mpmetis - from package: metis

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