jpegtoexr: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/jpegtoexr - from package: exrtools

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