deskmenu: command not found

Have You tried accessing the binary with the full path?

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/deskmenu - from package: deskmenu

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