keylookup: 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/keylookup - from package: signing-party

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

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