tkdesk: 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/tkdesk - from package: tkdesk

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

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