mkgmapgui: 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/mkgmapgui - from package: mkgmapgui

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

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