Are you looking for HDR Creation Software in Ubuntu? I recently tried 2 methods and they are :

• Qtpfsgui, don't let the name makes you think that this is another command-line-driven head-ache-generator Linux software. As a matter a fact this software is very intuitive and easy to use. After installation, just run it and click the New HDR icon to bring up a HDR creation wizard that will lead you step by step to create your HDR photo. Easy...
  It is available in Ubuntu repository, so fire up Ubuntu Software Center to get it.
  
  
• with GIMP plugin, by installing this script your GIMP can instantly makes fake HDR look. Get the script here, the page is in Italian but the script is in English.
  Copy the downloaded script to /home/username/.gimp-2.6/scripts/
  
  
  
  

Give it a try.


keyword : ubuntu, HDR
From Nikon Gallery and here, my photoblog.