Tool to add shapes, annotations and text using templates to images

Often I need to annotate (draw some arrows, lines, basic shapes like squares, ellipses etc and enter some text) on top of pictures (JPG, PNG images) and screenshots (again png images). I would also need to be able to crop, resize etc.

I tried the Gimp but I could only enter text and perform all image transformations but couldn't find a way to draw boxes etc.

I finally settled to Openoffice.org draw, but I know that isn't what I want, because in oodraw I need to insert my pic into a drawing and resize it (or the drawing) to fit and then go about making changes and finally export to png...

Is there any image editor that allows adding shapes and text to jpg & png files and save the modified file in its place? If the tool can also have template collections (like dia does) for shapes that is an added bonus.

Warning: broken. Shutter is severely broken in Ubuntu 18.04 and not available in later versions.

Shutter (which you can install from the Ubuntu Software Centre or sudo apt-get install shutter) is a tool which has a variety of options for taking and annotating screenshots. (Note: You can annotate any images of your choice, not just screenshots.)

Flameshot

It comes with some cool annotation features like Freehand drawing, Lines, Arrows, Boxes, Circles, Highlighting, Blur, etc. It also comes with many on-screen buttons as well lots of customization options.

Its written with QT/C++ and it's very easy to install in Ubuntu(18.04+).

apt install flameshot

You can also try to compile for older versions.