tkx-ed: 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/tkx-ed - from package: libtkx-perl

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

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