kde-add-printer: 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/kde-add-printer - from package: print-manager

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

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