When i initially installed IntelliJ in Ubuntu the font of the IDE really sucked. I couldn't able to concentrate on my work because of the freaking font style. After looking out various forums and blogs i finally did a revamp to my Intellij that looked perfect to me. Here is a screenshot of my IDEA after modification.

If you are facing same issues try out these steps and your life with IDEA will be much better.

• Open the file idea.vmoptions.
  cd {IDEA directory}/bin
  
  sudo vim idea.vmoptions
  Add '-Dawt.useSystemAAFontSettings=on' (without quotes) to the end of file.
  Save and exit the editor.
• Install Inconsolata.ttf to Ubuntu.
• Goto System -> Preferences -> Appearance
• Goto the Fonts tab and click on Details and set your Resolution to 120 DPI.
• Open IntellijIDEA. Goto Project Settings -> Colors & Fonts Select General tab and Click on the button near the Name textbox.
• Uncheck the 'Show Only Monospaced Fonts' . Now you will find Inconsolata in the list . Select Inconsolata as font , Set Size to 16 and Line Spacing to 1.0 then click on Apply.
• Back in the Settings menu choose Appearance and Select 'Use Anti-Aliased Font in Editor' option.

Thats it. You are done.