jp2info: 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/jp2info - from package: pirl-image-tools

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

Error in other languages:
jp2info: bevel nie gevind nie
jp2info: comandă negăsită
jp2info: comando não encontrado
jp2info: commande introuvable
jp2info: command not found
jp2info: käsku ei ole
jp2info: không tìm thấy lệnh
jp2info: komanda nerasta
jp2info: Kommando nicht gefunden.
jp2info: kommandot finns inte
jp2info: komut yok
jp2info: nie znaleziono polecenia
jp2info: níor aimsíodh an t-ordú
jp2info: no se encontró la orden
jp2info: no s'ha trobat l'ordre
jp2info: opdracht niet gevonden
jp2info: parancs nem található
jp2info: perintah tidak ditemukan
jp2info: príkaz nenájdený
jp2info: příkaz nenalezen
jp2info: команда не найдена
jp2info: командата не е открита
jp2info: 命令找不到
jp2info: コマンドが見つかりません