lv: 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/lv - from package: lv

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

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