Missing date & time from top panel of Unity Desktop - Ubuntu 14.04



yesterday I was tweaking the settings to enable more than four workspaces. I managed, but today when I switched on the computer, the Unity sidebar was missing (and also the top bar).

I think it might be connected to the way I was first trying to implement the workspace change. Unfortunately I cannot find the page anymore where I got the advice, but it included issuing the command 'metacity --replace'.

In the end I think I used Compiz Config Settings Manager to have more than four workspaces, but anyway today I have no Unity side or top bar. Originally I lost window frames too, but I managed to get them back on in CCSM. But not the sidebar or the top bar.

If I log in with 'Gnome (Compiz)' I get the Gnome style menus and bars ok, and if I log in as Guest with Unity, I get the sidebar. With Gnome Compiz login I had to make myself a desktop launcher for terminal to run any programs (like ccsm) while logged in with Unity.

So I guess there's some...

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This quick tutorial is going to show you how to reset unity and compiz if you messed up your Unity desktop in Ubuntu 14.04 Trusty Tahr. All you need to do is run two commands in a terminal window.

Don’t be scared if you’re not comfortable with Linux commands. Just copy the code via Ctrl+C, then paste it into the terminal via Ctrl+Shift+V and finally hit Enter to run.

To get started, press Ctrl+Alt+T to open a terminal window. When it opens, run the below command to reset Unity and Compiz settings:

dconf reset -f /org/compiz/

After that, run the below command to restart Unity:

setsid unity

Now your unity desktop and compiz effects should reset to the original status.

To get back the default set of Unity Launcher icons, run below command and then log out and back in.

unity --reset-icons

If you want to restore default icon theme, use Unity Tweak Tool which is available in Ubuntu Software...

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Although the Unity Desktop Manager has made HUGE performance and usability strides since the initial release in Ubuntu 11.10, some people are still put off by a number of the limitations in customizing the look and behavior of the window manager. We are going to take a look at how to customize Unity and bring back a sense of control to your desktop.

Unity Customizations Available
In Ubuntu 14.04, Unity has several customizations that are available that were not previously. If you log into Unity, go the the “Settings” and choose “Display”, you will see the following screen:

Ubuntu 14.04 LTS Display and Unity Settings

Most of what you see is new since the Ubuntu 11.10 Unity introduction and several are new since just the latest version of Ubuntu 13.10. New since 13.10 are the ability to scale the menu and title bars. This is useful in very high resolution screens OR as a visual impairment option. Everything scales equally.

Specific to...

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I am using Ubuntu 14.04 (Unity) as the Distro to support a media centre (XBMC and MythTV). For this purpose Unity is mostly suitable, especially with the Unity Launcher set to Auto-hide. I moved away from using the XFCE desktop for the media centre because recent versions of XFCE seem to not be supporting large screen 1080P devices (i.e. large screen TVs) as well as XFCE used to. For example, screen fonts in many applications will be too small and only one pixel in thickness, making them too hard to read. Changing font settings seems not to help. Unity at least seems to handle the large screen 1080P devices a littlebetter than XFCE - hence my reason for using XFCE.

Unfortunately, when watching a video in full-screen mode, the Unity Top Panel remains visible covering the top edge of the screen. For a media centre, this is not acceptable, as the presence of the Unity Top Panel over the top of the video being viewed is distracting to the viewer, and it's appearance detracts...

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It is missing from the settings panel, and the option in the clock indicator goes nowhere.
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2014-02-08 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140207)
Package: gnome-control-center 1:3.6.3-0ubuntu50
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.13.0-7.26-generic 3.13.1
Tags: trusty third-party-packages
Uname: Linux 3.13.0-7-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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Stephen Webb & team have lead an effort to bring Unity 8 to Ubuntu 14.04, which was done in parallel of other great work the team has landed for Ubuntu 14.04, e.g. locally integrated menus, hiDPI support and Mir support in SDL.

Just in time for Ubuntu 14.04 LTS the team has landed more improvements to make Unity 8 a feasible preview. It will not be installed by default as it doesn’t meet our quality criteria for an LTS release, but it is there for interested parties to follow us on our path to convergence.

You can install it from the Ubuntu archives via

$> sudo apt-get update $> sudo apt-get install unity8-desktop-session-mir

Loging out of Unity 7 should then give both options in the login screen. But see for yourself:


So what? Developers, developers, developers…!

Unity 8 already is the default desktop shell on Ubuntu for mobile devices and we will make it the default desktop shell for the Ubuntu...

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So, I've been trying to speed up ubuntu and decided to erase Unity entirely before installing a different desktop-environment.

I still have access to terminal when I boot ubuntu but can't use apt-get to reinstall unity-desktop or perform any other operation that requires internet connection. I've tried recovery mode with enabled network but the following command hangs

dhclient wlan0

Tried messing with network interfaces and its setup but still no luck.

On the bright side, I have a dual boot with windows 8(with internet) and Ubuntu 14.04 And also made a liveUSB with the same ubuntu distro.

I don't want to lose any files or setting on ubuntu (have couple of servers set up with development files in it), so fresh reinstall isn't an option.

Anyway I could use usb to reinstall unity/gnome-core packages, or whatever I need to get up and running with internet connection from which point I can reinstall all the required packages.

Also, I tried...

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Ahoy, programming-language tinkerfolk! Today's rambling missive chews the gnarly bones of "inline caches", in general but also with particular respect to the Guile implementation of Scheme. First, a little intro.

inline what?

Inline caches are a language implementation technique used to accelerate polymorphic dispatch. Let's dive in to that.

By implementation technique, I mean that the technique applies to the language compiler and runtime, rather than to the semantics of the language itself. The effects on the language do exist though in an indirect way, in the sense that inline caches can make some operations faster and therefore more common. Eventually inline caches can affect what users expect out of a language and what kinds of programs they write.

But I'm getting ahead of myself. Polymorphic dispatch literally means "choosing based on multiple forms". Let's say your language has immutable strings -- like Java, Python, or Javascript. Let's say your...

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