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I dont know whats wrong with My Ubuntu but my top panel was gone its proper look .Help me to restore it . i am giving you the sample image .enter image description here

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have you been playing with themes? what happens if you change your theme in myunity/appearance screen? – fossfreedom Jun 10 '12 at 10:54
@fossfreedom No changes are applying even i have changed my theme from appearance settings .I have Ubuntu tweek installed . – Raja Jun 10 '12 at 10:58
maybe the icon theme? I notice that the icons change with the thickness of the panel. – Mateo Jun 10 '12 at 11:15
but how could i change it , i have tried with Ubuntu Tweek too by setting to default . – Raja Jun 10 '12 at 11:23
the only other way I know is to manually change out the names of the icons on the theme, so we need to know the name of the theme you are using, to change out the icons, I had the same problem on my machine, it was showing a ugly gray wireless icon for the Internet instead of the normal colorful arrows, also what are the different indicators you are using, I can Identify the mail, network and sound, so if you say what the others are and the name of the theme you use, we can guide you through changing the icons out. – Mateo Jun 10 '12 at 18:27
up vote 1 down vote accepted

It's possible that the theme is using a smaller set of icons because of the thickness of the bar, or the icon theme got changed for the theme,if changing themes does not work try changing the icon theme for the theme or changing out individual icons in that theme. So here is an example using the default "Ambiance" theme.

So your icons look similar to this, worse in your case.

enter image description here

  1. We need to locate where the icons and themes are located.

    /usr/share/icons is one place that icons are located.

    /usr/share/themes is where the themes are located, it will be /usr/share/themes/Ambiance for our example

  2. In /usr/share/themes/Ambiance/index.theme it will list what icon theme it is using. In this case it is using ubuntu-mono-dark

enter image description here

Next with that information navigate to usr/share/icons/ubuntu-mono-dark/status

This is where the status icons are, so then you need to select what pixel size your theme is using, from 16, 22, and 24. since your theme turned ugly it may be possible that it is using the 16 pixel icons.

But since you have a wired icon I don't think this is the case, For example the 16 folder does not contain nm-device-wired.svg an will use a different, most likely the wireless icon for the network.

You can then use gksudo Nautilus to be able to change the icons, in the folders.

Since it seems that all your icons are dark, I would suggest changing the icon theme from usr/share/themes/Ambiance/index.theme first. For example I changed ubuntu-mono-dark to ubuntu-mono-light to see what would happen, and it didn't take effect when just loging out then back in, so I had to change the theme to something else then back again for It to take effect, and It then looked like this- enter image description here
So you can then change that to any icon theme you have in usr/share/icons

Hopefully this will give you the basics so you can make your icons look however you want.

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