qjadeo: 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/qjadeo - from package: xjadeo

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