[SOLVED] gTthumb Could not save the file

Symptom

After editing a image, gThumb can't save the modifications and displays this error message (it could happen to jpeg as well):

Could not save the file

Could not find a suitable module to save the image as "image/png"

Solution

Open gThumb preferences (Edit > Preferences). On the Extensions tab enable the "Save images" extension.

Enabling «Save images» extension in gThumb

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