gconftool: 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/gconftool - from package: GConf2

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

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