lurker-search: 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-search - from package: lurker

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

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