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How To Fix “The Update Information Is Outdated” In Ubuntu 14.04
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================================================================================
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Seeing a red triangle in top panel in Ubuntu 14.04 that displays the following error?
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> The update information is outdated. This may be caused by network problems or by a repository that is no longer available. Please update manually by selecting ‘Show updates’ from indicator menu, and watching for any failing repositories.
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It looks something like this:
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Instead of red triangle, there is a pink exclamation sign because I am using one of the [best Ubuntu icon themes][1], Numix. Coming back to the error, this is a common update problem which you might see every now and then. Now you might be wondering what is causing this update error.
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### Reason for ‘update information is outdated’ error ###
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The reason is pretty explanatory in the error description itself. It reads “this may be caused by network problems or by a repository that is no longer available”. So, either you upgraded your system and some repository or PPA is no longer supported or you are facing some similar issue.
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While the error is self-explanatory, the action it suggests, “Please update manually by selecting ‘Show updates’ from the indicator menu, and watching for any failing repositories.”, doesn’t work properly. If you click on Show updates, all you’ll see is that the system is already updated.
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Weird isn’t it? How will we find out what is failing where and why?
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### Fix ‘update information is outdated’ ###
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The ‘solution’ discussed here will work for Ubuntu versions be it Ubuntu 14.04, 12.04 or 14.04. All you need to do is to open a terminal (Ctrl+Alt+T) and use the following command:
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sudo apt-get update
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Wait for the command to finish and look at the result. Quick tip to add here, you can [add notifications in terminal][2] so that you are notified as soon as a long command finishes execution. In the last few lines at the end of the command, see what kind of error your system is facing. Yes, you’ll see an error for sure.
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In my case, I saw the famous [GPG error: The following could not be verified][3] error. Apparently there is some problem with [Spotify installation in Ubuntu 15.04][4].
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It is very much possible that you might see a different error instead of the GPG error like me. In that case, I suggest you to go through this article which I wrote to [fix various common update errors in Ubuntu][5].
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I know few people, specially beginners have strong aversion to command line but if you are using Linux, you simply cannot avoid terminal. Moreover, it is not that scary a thing. Give it a try, you will feel accustomed to it soon enough.
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I hope this quick tip helped you to fix the recurring “update information is outdated” in Ubuntu. Any questions or suggestions is welcomed.
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/fix-update-information-outdated-ubuntu/
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作者：[Abhishek][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:http://itsfoss.com/best-icon-themes-ubuntu-1404/
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[2]:http://itsfoss.com/notification-terminal-command-completion-ubuntu/
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[3]:http://itsfoss.com/solve-gpg-error-signatures-verified-ubuntu/
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[4]:http://itsfoss.com/install-spotify-ubuntu-1504/
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[5]:http://itsfoss.com/fix-update-errors-ubuntu-1404/
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How To Manage StartUp Applications In Ubuntu
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Ever felt the need to **control startup applications in Ubuntu**? You should, if you feel that your Ubuntu system is very slow at the boot time.
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Every time you boot in to an operating system, a number of applications start automatically. These are called ‘startup applications’ or ‘start up programs’. Over the time, when you have plenty of application installed in your system, you’ll find that there are too many of these ‘startup applications’ which start at the boot time automatically, eats up the system resource and slows down the system. This might result in a sluggish Ubuntu experience, which I think, you don’t want at all.
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A way to make Ubuntu faster is to control startup applications. Ubuntu provides you GUI tools that you can use to find out the startup programs, disable them entirely or delay their execution so that you won’t have each application trying to run at the same time.
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In this post we shall see **how to control startup applications, how to run an application at startup and how to find hidden startup applications in Ubuntu**. The instructions provided here are applicable to all Ubuntu versions such as Ubuntu 12.04, Ubuntu 14.04 and Ubuntu 15.04.
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### Manage startup applications in Ubuntu ###
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By default, Ubuntu provides Startup Applications utility that you could use. No need of installation. Just go in Unity Dash and look for startup applications.
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Click on it to start. Here is what my startup applications look like:
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### Remove startup applications in Ubuntu ###
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Now it is up to you what you find useless. For me [Caribou][1], on screen keyboard program, is not of any use at the startup. I would prefer to remove it.
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You can choose to either prevent it from starting up at boot time but keeping it in the startup applications list for future reactivation. Click on close to save your preference.
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To remove a program from startup applications list, select it and click on Remove from the right window pane.
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Note that, this will NOT uninstall the program. Just that the program will not start automatically at each boot. You can do it with all the programs that you don’t like.
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### Delay the start up programs ###
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What if you do not want to remove programs at the start up but you are worried about system performance at the boot time. What you can do is to add a delay in various programs so that not all the programs will be starting at the same time.
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Select a program and click Edit.
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This will show the command that runs this particular program.
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All you need to do is to add sleep XX; before the command. It will add a delay of XX seconds before running the actual commands to run the applications. For example if I want Variety [wallpaper management application][2] for 2 minutes, I’ll add sleep 120; before the command like this:
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Save it and close it. You’ll see the impact at the next boot.
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### Add a program in the startup applications ###
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This could be tricky for beginners. You see, things are in commands at the bottom of everything in Linux. We just saw in the previous section that these startup programs are just some commands being run at each boot. If you want to add a new program in the startup, you’ll need to know the command that runs the application.
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#### Step 1: How to find the command to run an application? ####
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Go in the Unity Dash and search for Main Menu:
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This contains all the program that you have installed in various categories. In old Ubuntu days, you would see similar menu for selecting and running applications.
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Just look for your application under various categories and click on the Properties tab to see the command that runs this application. For example, I want to run Transmission Torrent client on start up.
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This will give me the command that runs Transmission:
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Now I’ll use the same information to add Transmission in startup applications.
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#### Step 2: Adding programs in startup ####
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Go again in Startup Applications and click on Add. This will ask you enter a name, command and description. The command is the most important of all. You can use whatever name and description you want. Use the command you got from previous step and click on Add.
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That’s it. You’ll see it in the next boot up, running automatically. This is all you can do with startup applications in Ubuntu.
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So, far we have discussed about applications that are visible in startup but there are many more services, daemons and programs that are not visible to Startup applications. In next section, we shall see how to see hidden startup programs in Ubuntu.
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### See hidden startup program in Ubuntu ###
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To see what are the services running at startup, open a terminal and use the following command:
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sudo sed -i 's/NoDisplay=true/NoDisplay=false/g' /etc/xdg/autostart/*.desktop
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This is just a quick find and replace command that changes the NoDisplay=false with NoDisplay=true in all the programs that are in autostart. Once you do this, open Startup Applications again and now you shall see many more programs here:
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You can manage these startup applications the same way which were described earlier. I hope this tutorial helped you to control startup program in Ubuntu. Any questions or suggestions are always welcomed.
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/manage-startup-applications-ubuntu/
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作者：[Abhishek][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:https://wiki.gnome.org/action/show/Projects/Caribou?action=show&redirect=Caribou
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[2]:http://itsfoss.com/applications-manage-wallpapers-ubuntu/
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Howto Interactively Perform Tasks with Docker using Kitematic
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================================================================================
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In this article, we'll learn about the installating Kitematic in Windows Operating System and deploying a Hello World Nginx Web Server. Kitematic is a free and open source software which is a modern designed GUI software that allows us to interactively perform tasks with docker. Kitematic has a beautiful design and pretty good interface. It is pretty fast and easy to setup our containers out of the box without needing to enter commands for it, we can deploy our apps it in just a click with its GUI inteface. Kitematic has Docker Hub Intergration which allows us to search any required image, pull and deploy our apps with it. It also has a beautiful feature to switch to CUI mode simultaneously. Currently, it includes some features like automatically map ports, visually change environment variables, configuring volumes, streamline logs and many more.
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So. here are the easy 3 steps on how we can install Kitematic and deploy Hello World Nginx Web Server in Windows.
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### 1. Download Kitematic ###
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First of all, we'll need to download the latest release of Kitematic available for windows operating system from the github repository ie [https://github.com/kitematic/kitematic/releases][1] . Here, we download its executable EXE file using a download manager or a web browser. After we finish downloading, we'll need to double-click the executable application file.
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After double clicking the application file, we'll be asked by a security issue we'll simply click OK as shown below.
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### 2. Installing Kitematic ###
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After the executable installer has been downloaded, we'll now gonna install Kitematic in our Windows Operating System. The installer will now begin to download and install the necessary dependencies virtual box and docker to run Kitematic. If you already virtualbox installed in your system, it will upgrade it to the latest version. The installer should finish in few minutes but that depends on how fast your internet and system is. If you don't have a virtual box installed already, it may ask you for installing the virtual box network driver. It is suggested to install that as it is useful for the virtual box networking.
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After the required dependencies Docker and Virtual box are installed and are running, we'll be asked to login to the Docker Hub. If we don't have an account or don't wanna login now, we can click **SKIP FOR NOW** to continue further.
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If you don't have an account, you can simply click on Sign Up link in the App and create an account in Docker Hub.
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After its done, our first interface of Kitematic App will load. Here, below is how it looks. We can search for the available docker images there as shown below.
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### 3. Deploying Nginx Hello World Container ###
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Now, as our Kitematic has been successfully installed, we'll now go for the deployment of containers. To run a container, we can simply search for the image in the search area. Then click on Create to deploy the container. Here in this tutorial, we'll go for deploying a small Nginx Web Server having Hello World homepage. To do so, we'll search for Hello World Nginx in the search area. Then, after we see the container information, we'll click on Create to deploy the container.
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Once the download of the image has been completed, it will get deployed. We can see the logs of the commands fired by the Kitematic to deploy that container. We can also see the web page preview right from the Kitematic interface. Now, we can check our Hello World page from our web browser by clicking on the preview.
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If we wanna switch to command line interface and manage docker with it, there is a button called Docker CLI which will open a Powershell were we can execute docker commands.
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Now, if we wanna configure our container and perform stuffs like changing the container name, assigning environment variables, assign ports, configure container's storage and other advanced features, we can do that from Settings tab of the container.
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### Conclusion ###
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Finally we've successfully installed Kitematic and deployed a hello world nginx web server in Windows Operating System. It is always recommended to download and install the latest release of Kitematic as many advanced features are to be embedded. As docker works in 64 bit platform, Kitematic is also currently built for 64-bit platform of operating system. It only works on the Windows 7 and greater versions of Windows. Here, in this tutorial, we deployed an Nginx web server like wise we can deploy any docker container from its image using Kitematic with few clicks only. Kitematic is already available for Mac OS X and Windows whereas a version for Linux is still under development and will be out very soon. If you have any questions, suggestions, feedback please write them in the comment box below so that we can improve or update our contents. Thank you ! Enjoy :-)
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/interactively-docker-kitematic/
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作者：[Arun Pyasi][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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[1]:https://github.com/kitematic/kitematic/releases
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