lcrack_mkword: 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/lcrack_mkword - from package: lcrack

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

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