lives: 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/lives - from package: lives

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

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