gconf-schemas: 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/sbin/gconf-schemas - from package: GConf2

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

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