gconf-editor: 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 CentOS possible default full paths are:

/usr/bin/gconf-editor - from package: gconf-editor

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gconf-editor - from package: gconf-editor

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

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