mtools: 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 CentOS possible default full paths are:

/usr/bin/mtools - from package: mtools

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

On Debian possible default full paths are:

/usr/bin/mtools - from package: mtools

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

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