lrs: 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/lrs - from package: lrslib

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

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