kprinter4: 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/kprinter4 - from package: kprinter4

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

Error in other languages:
kprinter4: bevel nie gevind nie
kprinter4: comandă negăsită
kprinter4: comando não encontrado
kprinter4: commande introuvable
kprinter4: command not found
kprinter4: käsku ei ole
kprinter4: không tìm thấy lệnh
kprinter4: komanda nerasta
kprinter4: Kommando nicht gefunden.
kprinter4: kommandot finns inte
kprinter4: komut yok
kprinter4: nie znaleziono polecenia
kprinter4: níor aimsíodh an t-ordú
kprinter4: no se encontró la orden
kprinter4: no s'ha trobat l'ordre
kprinter4: opdracht niet gevonden
kprinter4: parancs nem található
kprinter4: perintah tidak ditemukan
kprinter4: príkaz nenájdený
kprinter4: příkaz nenalezen
kprinter4: команда не найдена
kprinter4: командата не е открита
kprinter4: 命令找不到
kprinter4: コマンドが見つかりません