If you’ve recently tweaked the appearance of your Ubuntu installation, and selected anything other than the default Human theme, chances are that you may find some of your icons blurry. This is because the Human theme uses 24×24 icons and (probably) all others use 22×22. Therefore, choosing anything other than Human theme would compress all remaining icons on the main menu that has no corresponding icon from the newly selected theme, making them blurry.
Read about the workaround on my blog.
Related posts: