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• How to restore/change Alt+Tab behaviour/ram usage and a few other things after Ubuntu upgrade from 11.04 to 11.10?

  - by fiktor

  I use Ubuntu for programming. I recently updated it from 11.04 to 11.10. There are some things I don't like in the new version of Unity desktop interface. I don't actually know if it is hard to restore previous behavior or not, and if it is not, where should I look to do that. I know a bit of programming, but I really don't know much about Linux settings. I used to have 3-6 terminal windows and switch between them with Alt+Tab and Shift+Alt+Tab. I liked half-transparent terminal windows, since with them I could open web-page with some instruction in Firefox, press Alt+Tab and type commands in a console window, being able to recognize text on a web-page under it. Now I have problems with my usual work-style because of the following. List of "negative" changes Alt+Tab shows just one icon for all console windows. When I wait some time, it, however, shows all windows, but I don't like to wait. I prefer to remember order of windows and press Alt+Tab as many times as I need to switch to the right window. Alt+Shift+Tab to switch in reverse order doesn't work now. Console windows are not transparent any more. When I don't wait, and switch to this icon, it shows all console windows altogether. So even if they were transparent, I wouldn't be able to see anything below them (I can read something only from the window, which is directly under current one, not a few levels under). When I run a few console windows in Unity I had 740Mb used on Ubuntu 11.04, but I have 1050Mb now. The question is how to make it back to 750-. I really need my memory, since I use my computer to work with 1512Mb of data and I try to save every 10Mb possible (if it doesn't take too much of machine and, more importantly, my time). When I press "The Super key" I have a field to type the name of the program I want to run. But now it sometimes shows this field, but when I'm trying to type nothing happens. Probably, focus is not on the right field. I don't really mean to restore exactly the same behavior, but I want to make my work in Ubuntu 11.10 efficient (at least as efficient as in Ubuntu 11.04). I would be happy if there are some ways to accomplish that. What have I tried I have installed CompizConfig Settings Manager. I have read this question. However enabling "Static Application Switcher" makes Alt+Tab crazy: after enabling it It says about key-binding conflicts with "Ubuntu Unity Plugin"; "Alt+Tab" switching doesn't change, but "Shift+Alt+Tab" now works and shows all windows; Memory usage increases. I have tried turning off Ubuntu Unity Plugin, but this doesn't seem right thing to do, since it seems to turn off all menus, a lot of keystrokes and app-launcher, which usually activates with "The Super key". I have found, that window transparency can be enabled by "Opacity, Brightness and Saturation" plugin from Accessibility. However I don't know if enabling it is the right thing to do (at least it increases memory usage). Update: everything solved but #3: see my own answer below. I have made a separate question about issue #3 (transparency).

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• what's the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 byte is called overhead, but didn't explain it. Also objects have overheads, which is 16 bytes. What exactly are these overheads? Also, do these overheads only exist in Java? How about C, C++ and Python?

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• Install/Downgrade kernel to v3.5.5 on Ubuntu 13.04

  - by Villi Magg

  I've been looking around the internet for a solution to downgrade the kernel from 3.8 to 3.5.5 since I've got the AMD/Ati Radeon Mobility HD 5600 graphic card on my machine. This video card in unfortunately not supported by the 3.8 kernel. And then when I've downgraded the kernel I need to install a version 12.* of the AMD Catalyst driver. There is too much in stake to wipe out the current installation of the OS and install an older OS. So I would like to avoid doing that to the ends of the world. Hope someone can help me with this one? Kind regards! Villi Magg.

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• Video playback not working in Ubuntu 11.10

  - by Dave M G

  (Ubuntu 11.10, Gnome Classic with Compiz, Nvidia graphics card) This problem occurs with every and all video, whether it's a Youtube video in Firefox, an AVI file in movie player, or any other video. Video simply does not work. When I start any kind of video, the image halts after a second or two. The sound, however, continues. Before it seemed that if I delete all the files in ~/.gstreamer-0.10/, then reboot, the video will play. However this is no longer the case. Manipulating files in that directory does nothing to help the situation. I am now no longer sure this is a gstreamer issue or something else. I am open to any and all possibilities. How can I get video playback to run smoothly on my machine?

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• dpkg --set-selections from 11.10 on 12.04LTS

  - by Vixxo

  I have to move a server to a different DC in a different country. The server is currently running 11.10, but the new fresh installed OS will be 12.04. The hardware of both is completely different. In order to install the same packages that the server currently uses, I am thinking of exporting all packages to a list and then run this list on the new machine. I will after that proceed with transferring the configuration files for the LAMP stack. My question is if this will work, or if there will be a problem because of the differences in the versions of the OS? What is the correct way to do it? PS. I have no access to KVM to reload the OS as an image, so this would not be an option.

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• Firefox booste de 10 à 26 % ses performances JavaScript avec IonMonkey, la bêta de la version 18 est sortie

  Firefox booste de 10 à 26 % ses performances JavaScript avec IonMonkey la bêta de la version 18 sort Le prochain Firefox sera doté d'un nouveau moteur JavaScript permettant d'obtenir de meilleure performance pour les applications Web complexes. Les utilisateurs peuvent déjà avoir un premier aperçu du gain en rapidité de cette mouture grâce à la bêta de Firefox 18 qui est disponible en téléchargement. Firefox 18 introduit le nouveau compilateur JavaScript « Just In Time » IonMonkey, qui permet d'exécuter le code non pas au sein du navigateur, mais directement sur le processeur de la machine. IonMonkey se distingue du moteur JägerMonkey avec l'é...

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• Reasons to disable game save during combat (e.g. Mass Effect 2)

  - by Steve V.

  So I've been playing Mass Effect 2 (PC) and one of the things I've noticed is that you can only save your game when you're not engaged in combat. As soon as the first enemy shows up on your radar, the save button is disabled. Once combat is over, save functionality reappears. It seems reasonable to assume that Mass Effect 2 is a state machine, and therefore, the internal state of the program at any moment can be captured and reloaded later. This is basically a solved problem - games have been designed this way since the Half-Life era. It also seems reasonable to assume that BioWare knew what they were doing when they made the decision not to follow this model - it's a tried and true system; BioWare wouldn't have done it the way they did without some good reason. What reasons are there to disable game save functionality during combat?

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• 3G dongle and memory card detection

  - by user212632

  My questions is about 3G dongle (Huawei E1752) that I use for my internet on Ubuntu 12.04. The big issue is that ubuntu only recognise the dongle if I plug it in before booting up. But if somehow I loses connection (due to network being low) then the only way to use the 3G dongle again is to reboot my machine, which becomes a pain. I have the same issue with the memory card reader of my laptop whereby it only reads when I insert the card before booting up. My laptop is an Acer V3 -571g. At first I thought it was an issue that the model was quite new, but I have been updating my ubuntu for a while, and this issue has kept being the same

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• Why are PPA's designed for only latest version?

  - by user210108

  Why are PPA's set to only retain the latest version of the software? I ask because I just installed Blender 2.69 and it constantly crashes on me; I then decided to just install 2.68a but found that it is IMPOSSIBLE to install an older version of software using the Ubuntu software center. I turned to possibly seeing if the PPA retained an older version but have found most PPA's remove older versions as they are designed to only offer the latest. How does this sound like a good idea? What if, for example, someone releases a version of their software that constantly crashes and the user wishes to get an older version but because the way PPA's are designed they cannot. Sounds familiar... To add insult to injury, I was easily able to role back Internet Explorer to version 9 on a machine at work today; that is just sad.

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• 25 années d'évolution de Windows retracées en moins de dix minutes, et pour l'avenir de l'OS? que prévoyez-vous ?

  25 années d'évolution de Windows retracées en moins de dix minutes, et pour l'avenir de l'OS? que prévoyez-vous ? Pour tous les fans des produits Microsoft, je vous conseille de regarder cette vidéo. Il s'agit d'un montage captivant qui fait s'enchaîner les évolutions de Windows, depuis sa première version sortie en 1985, jusqu'à sa mouture actuelle qu'est Windows 7. Le moins que l'on puisse dire, c'est que l'OS a largement gagné en ergonomie et en graphisme. La vidéo a été réalisée par un passionné, qui a testé les différentes version du système sur une même machine pour réaliser son expérience. Source : La vidéo de l'évolution de Windows :

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• How to hide process arguments from other users?

  - by poolie

  A while ago, I used to use the grsecurity kernel patches, which had an option to hide process arguments from other non-root users. Basically this just made /proc/*/cmdline be mode 0600, and ps handles that properly by showing that the process exists but not its arguments. This is kind of nice if someone on a multiuser machine is running say vi christmas-presents.txt, to use the canonical example. Is there any supported way to do this in Ubuntu, other than by installing a new kernel? (I'm familiar with the technique that lets individual programs alter their argv, but most programs don't do that and anyhow it is racy. This stackoverflow user seems to be asking the same question, but actually just seems very confused.)

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• 12.10 update-manager is behaving strange?

  - by dschinn1001

  First I tried to update Kernel ( with 3.5.0-18 of your choice ) with update-manager. But update-manager crashed each time after 3 attempts when I typed my password ? Then I tried to update with terminal and apt-get as usual way. There then seems to be no update-files with a sudden after a pause --- Yes update-manager behaved strange, but it seems, that update-manager made a QUIET update ? There was nothing to see . . . I restarted my machine and new kernel is installed then.

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• Pillar Axiom OpenWorld Highlights

  - by uwes

  During the Storage General Session at Oracle OpenWorld Conference 2012 in San Francisco, the following Axiom-related announcements were made: Oracle Platinum Services for Axiom 600: Extending Oracle's Platinum Services to Axiom 600 as a standalone product –  the same level of service and support you get with Exadata – 24/7 fault monitoring, dedicated response and escalation management to meet enterprise-grade SLA’s, patch planning and management. Oracle Enterprise Manager Axiom Plug-in: Allowing DBA's to manage, maintain, monitor and provision the Axiom 600 storage system from Oracle EM. Oracle Virtual Machine Axiom Plug-in: Allowing Oracle VM and System Administrators to manage, maintain, monitor and provision the Axiom 600 storage system from Oracle VM using Storage Connect. Oracle Axiom Data Protection Manager 3.1: Leveraging Axiom's Copy Services, System Administrators can automatically create Application Consistent Clones of critical Windows and Oracle DataBase environments for quick recovery. For More Information Go To: Oracle.com Pillar Axiom Page Oracle Technology Network SAN Page

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• How to hide process arguments from other users?

  - by poolie

  A while ago, I used to use the grsecurity kernel patches, which had an option to hide process arguments from other non-root users. Basically this just made /proc/*/cmdline be mode 0600, and ps handles that properly by showing that the process exists but not its arguments. This is kind of nice if someone on a multiuser machine is running say vi christmas-presents.txt, to use the canonical example. Is there any supported way to do this in Ubuntu, other than by installing a new kernel? (I'm familiar with the technique that lets individual programs alter their argv, but most programs don't do that and anyhow it is racy. This stackoverflow user seems to be asking the same question, but actually just seems very confused.)

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• What is the point in using real time?

  - by bobobobo

  I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time. But should we use this information in basic physics simulation? It looks to me to be a bad idea. Say there is a slight lag on the machine, for whatever reason (say a virus scanner starts up). The calculations all jump, and there is no need for this. Why not use a virtual second and ignore wall clock time? For gameplay on the level of Commander Keen, shouldn't you always use the virtual second and not real-time? (Besides stopwatch timing for race games) I don't see a need to use real time and not a fixed 16ms time step.

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• Is it possible to change the group list shown on the application launcher?

  - by Grobbendonk

  I just installed Unity, on Ubuntu 10.10, to try it out. I've tried fiddling with a few things, but I can't work out how the applications are grouped and listed. I mean - if I click on the Applications in the launcher, we get the list of applications installed, with the option to narrow the selection by group. i.e. |Search box|All applications|Accessories|Games|Internet|Media|Office|System| My question is where that list is generated - my machine is mostly for work, so the games have been uninstalled (and I get a "there are no games on this box" message, which is nice), and there's a stack of other stuff I'd like to see under a new group of "work" or something. Obviously, a logical follow-up - how does unity know how to classify the applications into those groups? Is it the info in the .desktop links to them?

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• Why is Prolog associated with Natural Language Processing?

  - by kyphos

  I have recently started learning about NLP with python, and NLP seems to be based mostly on statistics/machine-learning. What does a logic programming language bring to the table with respect to NLP? Is the declarative nature of prolog used to define grammars? Is it used to define associations between words? That is, somehow mine logical relationships between words (this I imagine would be pretty hard to do)? Any examples of what prolog uniquely brings to NLP would be highly appreciated.

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• Trying to boot from USB on Asus q200e-bhi3t45 just brings me to grub menu

  - by Krash Kharma

  It's been a struggle every time I've tried to change my OS on this machine. I honestly don't even know how it works whenever it does. I've somehow managed to get Windows 7, Windows 8, Mint 14, Ubuntu 12.04, and 12.10 to work at random times but it's always after struggling with it and googling for random chance fixes and suddenly something clicks and it loads from usb, but 99% of the time, every time I try to boot from USB to install a distro (in this case, I'm trying to get ubuntu-12.04.2-desktop-amd64.iso to work) my pc just comes up with a grub menu ("Minimal bash-like blahblahblah - grub ") I don't know why it works when it works. Right now I've tried everything from with/without Fast Boot in BIOS, with/without CSM, with/without secure boot, to changing BOOTx64.EFI to bootx64.efi to downloading a new bootx64.efi to copying it to every folder on the usb.... It makes no sense to me. Sorry if this has been asked before but I can't find anything

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• Writing Ubuntu shell scripts

  - by Lukesh

  Write a script that will shut down one of your server called “appsserver” every night in order to preserve power. But before the appsserver is brought down, your script should do the following: Check if there are any users logged into the appsserver Check the size of the directory /usr/tmp is bigger than 1G and delete all its content. If (a) is true, send a broadcast message to all user that the machine will shut down in 20 minutes and that they should log out of the appsserver All the output of the commands in your script should be sent to a log file with the script running date appended to the log file itself (e.g. shutdown_14_Nov_2011.log).

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• VS2010 changes your ASP.NET Version on setup projects to 4 - regardless

  - by blomqvist

  When converting your projects to VS2010 you get the question to migrate them to .net4. But even if you do not do that VS set the ASP.NET version to 4 for setup projects. And then when you try to install your application on a machine that does not have .NET 4 installed you will get the error message: “Could not open key: Software\Microsoft\ASP.NET\4.0.30128.0. Verify that you have sufficient access to that key, or contact your support personnel” What you need to do is to change the ASP.NET version back to 2.0 if that is what you want to use. You do that in the properties of the setup project.

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• Engineered Systems Announcements at OOW

  - by Cinzia Mascanzoni

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif"; mso-bidi-font-family:"Times New Roman";} See below the  announcements of new Exa systems at OOW Oracle Exadata X3 Database In-Memory Machine and  Oracle Exalogic Elastic Cloud X3-2 announcements.

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• How to work around the home directory changing to /root when using sudo?

  - by Nathanel Titane

  Hello everybody! With Natty coming out soon, I've been at work updating my deployment and self-config script to make my desktop on 11.04 run and look the way I want it to. One bummer is that dbus seems to have changed and does not permit, in the same manner Lucid and Maverick did, the authentication of the current user by terminal call using grep and cat. Ideally, to run the script, I would sudo -s and then launch it as # chmod +x install && ./install Instead of returning my user name.. it now returns root and applies changes to the root profile and aborts whenever paths do not correspond. Here is my script header: #!/bin/bash ON_USER=$(echo ~ | awk -F'/' '{ print $1 $2 $3 }' | sed 's/home//g') export $(grep -v "^#" ~/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0) if sudo -u $ON_USER test -z "$DBUS_SESSION_BUS_ADDRESS" ; then eval `sudo -u $ON_USER dbus-launch --sh-syntax --exit-with-session` fi RELEASE=$(lsb_release -cs) How could I make it return the actual user now that natty is coming? Thanks for the help

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• What's New in Oracle VM VirtualBox 4.2?

  - by Fat Bloke

  A year is a long time in the IT industry. Since the last VirtualBox feature release, which was a little over a year ago, we've seen: new releases of cool new operating systems, such as Windows 8, ChromeOS, and Mountain Lion; we've seen a myriad of new Linux releases from big Enterprise class distributions like Oracle 6.3, to accessible desktop distros like Ubuntu 12.04 and Fedora 17; and we've also seen the spec of a typical PC or laptop double in power. All of these events have influenced our new VirtualBox version which we're releasing today. Here's how... Powerful hosts  One of the trends we've seen is that as the average host platform becomes more powerful, our users are consistently running more and more vm's. Some of our users have large libraries of vm's of various vintages, whilst others have groups of vm's that are run together as an assembly of the various tiers in a multi-tiered software solution, for example, a database tier, middleware tier, and front-ends.  So we're pleased to unveil a more powerful VirtualBox Manager to address the needs of these users: VM Groups Groups allow you to organize your VM library in a sensible way, e.g.  by platform type, by project, by version, by whatever. To create groups you can drag one VM onto another or select one or more VM's and choose Machine...Group from the menu bar. You can expand and collapse groups to save screen real estate, and you can Enter and Leave a group (think iPad navigation here) by using the right and left arrow keys when groups are selected. But groups are more than passive folders, because you can now also perform operations on groups, rather than all the individual VMs. So if you have a multi-tiered solution you can start the whole stack up with just one click. Autostart Many VirtualBox users run dedicated services in their VMs, for example, running a Wiki. With these types of VM workloads, you really want the VM start up when the host machine boots up. So with 4.2 we've introduced a cross-platform Auto-start mechanism to allow you to treat VMs as host services. Headless VM Launching With VM's such as web servers, wikis, and other types of server-class workloads, the Console of the VM is pretty much redundant. For some time now VirtualBox has offered a separate launch mechanism for these VM's, namely the command-line interface commands VBoxHeadless or VBoxManage startvm ... --type headless commands. But with 4.2 we also allow you launch headless VMs from the Manager. Simply hold down Shift when launching the VM from the Manager.  It's that easy. But how do you stop a headless VM? Well, with 4.2 we allow you to Close the VM from the Manager. (BTW best to use the ACPI Shutdown method which allows the guest VM to close down gracefully.) Easy VM Creation For our expert users, the  New VM Wizard was a little tiresome, so now there's a faster 2-click VM creation mode. Just Hide the description when creating a new VM. Powerful VMs  As the hosts have become more powerful, so are the guests that are running inside them. Here are some of the 4.2 features to accommodate them: Virtual Network Interface Cards  With 4.2, it's now possible to create VMs with up to 36 NICs, when using the ICH9 chipset emulation. But with great power comes great responsibility (didn't Obi-Wan say something similar?), and so we have also introduced bandwidth limiting to prevent a rogue VM stealing the whole pipe. VLAN tagging Some of our users leverage VLANs extensively so we've enhanced the E1000 NICs to support this.  Processor Performance If you are running a CPU which supports Nested Paging (aka EPT in the Intel world) such as most of the Core i5 and i7 CPUs, or are running an AMD Bulldozer or later, you should see some performance improvements from our work with these processors. And while we're talking Processors, we've added support for some of the more modern VIA CPUs too. Powerful Automation Because VirtualBox runs atop a fully blown operating system, it makes sense to leverage the capabilities of the host to run scripts that can drive the guest VMs. Guest Automation was introduced in a prior release but with 4.2 we've revamped the APIs to allow a richer and more powerful set of operations to be executed by the guest. Check out the IGuest APIs in the VirtualBox Programming Guide and Reference (SDK). Powerful Platforms  All the hardcore engineering that has gone into 4.2 has been done for a purpose and that is to deliver a fast and powerful engine that can run almost any x86 OS because of the integrity of the virtualization. So we're pleased to add support for these platforms: Mac OS X "Mountain Lion"  Windows 8 Windows Server 2012 Ubuntu 12.04 (“Precise Pangolin”) Fedora 17 Oracle Linux 6.3  Here's the proof: We don't have time to go into the myriad of smaller improvements such as support for burning audio CDs from a guest, bi-directional clipboard control,  drag-and-drop of files into Linux guests, etc. so we'll leave that as an exercise for the user as soon as you've downloaded from the Oracle or community site and taken a peek at the User Guide. So all in all, a pretty solid release, one that we hope you'll enjoy discovering. - FB 

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• Ubuntu Screensaver Freezes?

  - by user11833

  I am using ubuntu 10.04. Over the last couple of days, I am having a weird problem: once the machine gets into screen saver, it is impossible to get it "out". I do see the mouse cursor move as I move the mouse, but the login popup (with user / password) does not show up and the screen remains "frozen". Any idea what might be going wrong? For the time being, I have no choice but to restart the computer in order to be able to resume work. Thanks.

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• Make command error installing Postfix

  - by Newben

  I am installing Postfix and following a tutorial, there is a command that uses 'make' but I have an error message. More precisely : make makefiles CCARGS='-DDEF_CONFIG_DIR=\"/usr/local/postfix/etc\"' and the error message : make -f Makefile.in MAKELEVEL= Makefiles (echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) makedefs.tmp ATTENTION: ATTENTION: Unknown system type: Linux 3.2.0-23-generic-pae ATTENTION: make: * [Makefiles] Error 1 make: * [makefiles] Error 2 I installed 'build-essantial' package but I still have error message. Does anyone has an idea ?

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