I can't remember the exact version but Fedora Core started to ship F-Spot and let go of gthumb a while ago. Don't know when it happened with Ubuntu but these days most distributions are drifted towards the excellent Shotwell photo manager.
Anyhow gthumb is still developed and part of Gnome desktop and it's certainly is in the official repositories in Ubuntu as well.
*. By default it supports a lot of major image formats such as - BMP, JPEG, GIF, PNG, TIFF, ICO, XPM.
*. Choose different views (full screen, etc).
*. View images in various other ways such as - Flip/Rotate or Black-n-White, etc.
*. Create thumbnail previews, these thumbnails are saved in the Nautilus database so no space is "wasted".
*. Bookmark folders.
*. Copy/Move or delete.
*. Edit image tags - Comments, etc.
*. Organize pictures with catalogs.
*. Search and find images within the database with less time.
*. gthumb has a simple image editor with which you can do things like Edit/Crop/Rotate/Change colors, etc with ease.
*. Write to CDs, Set them as backgrounds or import images from other devices such as USB drives or Cameras, etc.
You can install gthumb 2.13 (current version) in Ubuntu 110.4 Natty Narwhal, 10.10 or 10.04 by entering the below command in your Terminal window.
sudo apt-get install gthumbEnjoy it :).