lamed: 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 CentOS possible default full paths are:

/usr/bin/lamed - from package: texlive

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/lamed - from package: texlive-omega

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

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