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Most, if not all, the user interface updated correctly when I went from Natty to Oneiric but the system button did not. How can I get rid of the ugly purple monitor icon to be replaced with the new icon used by Oneiric? Is it a Unity-2D thing?

Desktop Screenshot

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up vote 2 down vote accepted

In general your icon theme looks outdated. Open the system settings and change the theme to high contrast, then back to Ambiance.

If that doesn't fix it, then run:

  • sudo apt-get install --reinstall ubuntu-mono humanity-icon-theme.

If the theme does not automatically update, change the theme as mentioned above.

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Thanks Roland, switching to High Contrast then back to Ambiance worked. – Bryan Oct 27 '11 at 1:03

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