ktp-debugger: 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/ktp-debugger - from package: kde-telepathy-debugger

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

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