conkeror: 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/conkeror - from package: conkeror

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

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