getpdfpage: 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/getpdfpage - from package: libcam-pdf-perl

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

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