lurker-regenerate: 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-regenerate - from package: lurker

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

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