lava-mount-masterfs: 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/sbin/lava-mount-masterfs - from package: lava-server

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

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