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Windows equivalent : Adobe Illustrator
Ubuntu equivalent : Inkscape
Inkscape is a free software vector graphics editor, licensed under the GNU General Public License. Its goal is to implement full support for the Scalable Vector Graphics 1.1 standard. An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.
Inkscape is cross-platform and runs on Mac OS X (typically under X11, although the underlying GTK+ toolkit can be compiled to run natively under Quartz),Unix-like operating systems, and Microsoft Windows. Inkscape’s implementation of SVG and CSS standards is incomplete. Most notably, it does not yet support animation. Inkscape has multi-lingual support, particularly for complex scripts, something currently lacking in most commercial vector graphics applications. The word Inkscape is a portmanteau of the words ink and landscape.
sudo apt-get install inkscape
Access it through Applications † Graphics † Inkscape Vector Graphics Editor.