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How can I remove and re-install Unity?

Unity is misbehaving after installing GLX Dock - HUD does not open with GLX Dock turned off and there are ugly shadows in the panel, three control buttons (close, minimise, maximise) and "Ubuntu Desktop" label when there are no apps running. I have to click the top panel to get the Super key to open the Dash.

I have tried unity --reset and unity --replace commands, but they do not help.

Can I un-install and re-install Unity?

How do I restart Unity

I know about unity --reset command. But how can I simply restart Unity without resetting its profile?

How do I move applications from one workspace to another [closed]

I'm using 11.10 - please can someone let me know how can I move programs from one workspace to another.

I'm used to the Gnome-2 style - is there a way to achieve something similar in 11.10?

How do I get rid of this monitor error?

I have an Nvidia card and two monitors.

Every time I log in to Unity on Ubuntu 11.10, I get this error:

"Could not apply the stored configuration for monitors"

I have tried opening nvidia-settings, but none of my experimental alterations to any of the settings has made a difference.

I can still use my computer, but it seems to break the themes, icons, and styles so my computer looks like Unix circa 1992, which is a pretty annoying.

How do I kill this error?

How to disable window move with alt + left mouse button?

I have problem with this function because i work in Maya and other 3D applications that use this key combination... This option on Ubuntu 11.04 was in "window" section so i could change it to something else to avoid conflicts... where is this located in Ubuntu 11.10?

Does Unity require proprietary graphics card drivers?

I understood that the Unity desktop in Natty uses Compiz and therefore requires a graphics card driver that support composition effects. Does this mean if I have an ATI or NVIDIA card I'm forced to install a proprietory driver because the open source drivers for those cards do not support Compiz?

How to take screenshots of sections of the screen?

On Mac OS X, there is a handy key combo for taking a screenshot of any arbitrary rectangle section of the screen(Command-Shift-4).

Is there something similar(maybe Compiz plugin) for Ubuntu/Gnome?

How to set the terminal to open maximized

I want to tell compiz, metacity, the gnome-terminal or whoever is in charge to open the terminal window maximized by default.

How can I do that?

Can I drag a window onto another workspace?

I just updated to 11.04, now if I drag a window to the side of the workspace, the window is maximized to half of the screen. is there a way to move it to another workspace with the mouse?

I know you can right-click on the title and choose "move to Another Workspace", but I would like something quicker.

Is it normal for compiz to consume 40% of my CPU with no other programs running?

When I have no other programs running, compiz takes up at least 40% of my CPU.
Is this normal? If it is normal, is there anyway I could make this program take a smaller percentage?

How to correctly enable Desktop Cube in Unity 3D?

I have read several questions regarding how to fix an already enabled desktop cube or the problems it had in 11.04. But in 11.10, how can I correctly enable desktop cube in Unity 3D?

How do I adjust the alt-tab speed?

Alt-tab seems slow, my machine has the proper drivers installed and everything else is fast except alt-tab. Setting the plugin to show icons instead of window previews doesn't help.

Is this a bug or is a way to speed this up?

Using different wallpapers on multiple monitors (Gnome 2 + Compiz)

This seems like a simple question, yet I could not find any satisfying answer using Google or Ask Ubuntu.

So I have a triple-monitor setup. Basically what I want is simply to have a different background on each of the three monitors. Now I am not speaking about different virtual desktops (aka workspaces) here. Most of the solutions I googled were about different backgrounds on different workspaces. I have only the one workspace, but three monitors, like so:

Monitor 1 (on top) is my big TV that's attached to the wall above my two normal monitors.

I am using Gnome 2 with Compiz (aka gnome-session-fallback aka Gnome Classic (with effects) in the login manager dropdown list) on Ubuntu 13.04.

I tried the following methods trying to set a different background for each monitor:

1. ccsm (compiz-config-settings-manager), that is, setting a background via the window manager (Compiz). More precisely, I used the Wallpaper plugin of Compiz.
2. gnome-control-center, that is, setting a background via the Gnome System Settings. More precisely, I used the Background panel in the Gnome System Settings.
3. XDG_CURRENT_DESKTOP=Unity gnome-control-center, that is, settting a background via the Gnome System Settings, but mimicking Unity behavior. More precisely, I used the Appearance panel in the Gnome System Settings.

However, none of these methods seem to enable me to select a different background for each monitor. In each case, I can only set a single background (or possibly several that can then be cycled periodically, or used for different workspaces) for all three monitors. Then, I typically have options like center, tile, crop or scale that control how this single background is rendered across the three monitors.

The workaround I have gone with so far is to use Gimp to create one "big" background that encompasses the entire virtual resolution of all three monitors together. Basically, I create one big background image of size 3840x2160, in which I paste three backgrounds at the right places. Then I set this big background as the single background for the three monitors using possibility (1) or (3) above, and use the span option to span this big background across all three monitors. This results in three different backgrounds on the three monitors, provided the three smaller backgrounds were placed correctly on the big background image (Note: possibility (2) does not offer a span option).

However, this seems like an awful hack to achieve such a simple thing as setting a different background for each of my monitors. It also has several disadvantages:

• When I want to change the arrangement of the monitors (the big TV on top can be slided some way to the left or to the right, and I like to adjust the monitor positions accordingly using xrandr or an associated GUI such as the Displays panel in the Gnome System Settings, so as to keep mouse movement intuitive), clearly the upper background does not slide along with the monitor it's supposed to be displayed on, which means I only see part of the upper background.
• The big background has some gray areas (dead space) in the upper corners that are uselessly loaded at login time by Compiz or Gnome when the big background is loaded.
• Worst of all, when I want to change a single one of the three backgrounds, then I have to gimp-edit the whole big background. This is too much work considering I simply want to change a single background (yep, I know about Gimp layers, but still) - this ought to be possible with a few clicks and without a heavy-weight image manipulation program.

The first point means this workaround is not robust. The second means it is not efficient. And the third means it's a pain in the butt :)

So my question is this:

Is there some way - using either Gnome 2 or Compiz - to simply tell the system that I want a different background for each monitor? This would be the logical approach to me, as it would actually tell the system what my intention is. It would also be more efficient.

Really, it feels like this cannot be such an uncommon scenario. I would think many people have multiple monitors; and at least some of those must prefer to have different backgrounds on these monitors. So can it be true that there is no straightforward solution, and users are expected to come up with awful hacks such as creating their own custom backgrounds with heavy-weight programs in order to get this to work?

How can I reduce or increase the number of workspaces in Unity?

I was reading about how to get multiple workspaces in the mutter version of Unity, however since Compiz is replacing Mutter how do I go about adding and removing workspaces in Compiz version of Unity?

Why does Ubuntu use two window managers: Compiz and Metacity?

I'm a bit confused about this one. Does Ubuntu use two different window managers at the same time?