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Control Panel Breaks When Upgrading to 2.5.0

From Joomla! Documentation

When upgrading from 1.7.3 to 2.5.0, the Control Panel may appear "broken" after the upgrade. See the image on this page.

Control Panel may appear "broken" after the upgrade

Cause

This issue is caused by changes to the Administrative template. Your browser may still be holding portions of the administrative supporting files (CSS & JavaScript) in your browser's cache.

How to Fix

The fix is to clear your browser's cache.

Mozilla / Firefox / Safari: hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (Command-R on a Macintosh); Konqueror: click Reload or press F5; Opera: clear the cache in Tools → Preferences; Internet Explorer: hold Ctrl while clicking Refresh, or press Ctrl-F5.