icewm-gnome: 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/icewm-gnome - from package: icewm-gnome-support

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

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