lurker-index-lc: 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/lurker-index-lc - from package: lurker

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

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