print_server_display: 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/print_server_display - from package: ctn

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

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