Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, Freehand, CorelDraw, or Xara X using the W3C standard Scalable Vector Graphics (SVG) file format. Supported SVG features include shapes, paths, text, markers, clones, alpha blending, transforms, gradients, patterns, and grouping. Inkscape also supports Creative Commons meta-data, node editing, layers, complex path operations, bitmap tracing, text-on-path, flowed text, direct XML editing, and more. It imports formats such as JPEG, PNG, TIFF, and others and exports PNG as well as multiple vector-based formats.
Inkscape's main goal is to create a powerful and convenient drawing tool fully compliant with XML, SVG, and CSS standards. We also aim to maintain a thriving user and developer community by using open, community-oriented development
Install Inkscape in Ubuntu
sudo apt-get install inkscape
This will complete the installation
If you want top open this application go to Applications--->Graphics--->Inkscape Vector Illustrator
Once it opens the application you should see similar to the following screen
If you want to know how to use inkscape check here