icegrid-gui: 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/icegrid-gui - from package: icegrid-gui

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

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