cde-exec: 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/cde-exec - from package: cde

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

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