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After increasing the width of my Panel, I got something like

How can I fix this color issue?

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up vote 8 down vote accepted

It's a theme bug. The panel is using an image background that doesn't fit the width you're trying to use.

You will have either to change the background image at: /usr/share/themes/<Your_Theme's_Name>/gtk-2.0/panel.png

Or edit gnome-panel.rc file (gksu gedit /usr/share/themes/<Your_Theme's_Name>/gtk-2.0/apps/gnome-panel.rc ) and put # before the line with bg_pixmap[NORMAL] = "img/panel.png"

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