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Ubuntu 14.04 had gThumb 3.3.1 in its official repositories at some point but because starting with version 3.3.0, the application uses header bars (also known as client side decorations) and they don't work properly under Unity, gThumb was downgraded to version 3.2.7. And that's ok for Unity but how about Ubuntu GNOME and Linux Mint 17 (with Cinnamon 2.2.x) users?

Well, to make it easier to install, I've uploaded the latest gThumb 3.3.2 in the failsdownloads gThumb PPA for Ubuntu GNOME 14.04 and Linux Mint 17 with Cinnamon users.

Because gThumb 3.3.x uses header bars, the package from the failsdownloads gThumb PPA should only be used by GNOME Shell (Ubuntu GNOME) and Linux Mint 17 with Cinnamon users! If you try to use it under other desktop environments, you'll encounter various visual glitches - for instance, under Unity, gThumb will look broken with the default Ambiance theme: no window titlebar and weird looking header bars, no window shadow, etc.; with Numix, the header bars look ok but the window doesn't have any shadows and also, unless you remove the overlay scrollbars package, some parts of the gThumb window are transparent. So only use gThumb from the failsdownloads gThumb PPA under Ubuntu GNOME 14.04 (if you use GNOME Shell)!

Further more, gThumb in Ubuntu is built without Clutter support - this is enabled for the gThumb package available in the failsdownloads gThumb PPA, allowing the application to use some fancy transition effects for the slideshow. To use transition effects with the gThumb slideshow, from the gThumb preferences, on the "Viewer" tab, select the transition you want to use. Start the slideshow using F5.

Also, the PPA package is built with using libraw for better raw image support.

sudo add-apt-repository ppa:failsdownloadsteam/gthumb
sudo apt-get update
sudo apt-get install gthumb

If for some reason you don't like gThumb 3.3.x (you want to switch from GNOME Shell to Unity, etc.) and want to go back to the gThumb version available in the official Ubuntu 14.04 repositories (3:3.3.1.is.3.2.7-0ubuntu1 so version 3.2.7), use the following commands to purge the failsdownloads gThumb PPA and downgrade the application:

sudo apt-get install ppa-purge
sudo ppa-purge ppa:failsdownloadsteam/gthumb

gThumb is an image viewer/organizer that comes with basic image editing features such as cropping, resizing, rotation, image enhancing and more. Furthermore, the app can play videos, import images from digital cameras and it supports exporting images to services such as PicasaWeb, Facebook and Flickr.

The most interesting change in the latest gThumb 3.3.3 is the addition of two new image tools: special effects (which includes effects such as Desert, Soil, Fresh Blue, Mangos, Vintage, Blurred Edges, Negative and more) and color curves adjusting, which you can see in the screenshots below:

It's also important to mention that 3.3.x is the development series leading to the stable gThumb 3.4, so this release is not considered stable.

To make it easier to install in Ubuntu GNOME, Linux Mint, elementary OS Freya and so on, I've uploaded the latest gThumb 3.3.3 to the failsdownloads gThumb PPA.

Important note: gThumb 3.3.x uses header bars so it requires a desktop environment which supports that (Unity needs some hacks like disabling the header bars and remove the overlay-scrollbar to get it to work properly or else it will look like this) however, it looks like its menu (which holds the preferences) can only be accessed in GNOME Shell and Unity! That's why I recommend installing it only if you use Ubuntu GNOME.

sudo add-apt-repository ppa:failsdownloadsteam/gthumb
sudo apt-get update
sudo apt-get install gthumb

If for some reason you don't want to continue using the latest gThumb 3.3.3 and you want to downgrade to the version available in the Ubuntu / Linux Mint repositories which doesn't come with header bars, use the following commands:

sudo apt-get install ppa-purge
sudo ppa-purge ppa:failsdownloadsteam/gthumb

(using the instructions above, you'll install ppa-purge and then purge the failsdownloads gThumb PPA, which means that the PPA is disabled and then gThumb is downraded to the version available in the repositories)