lava: 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/lava - from package: lava-tool

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

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