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• How do I find the cause for a huge difference in performance between two identical Ubuntu servers?

  - by the.duckman

  I am running two Dell R410 servers in the same rack of a data center. Both have the same hardware configuration, run Ubuntu 10.4, have the same packages installed and run the same Java web servers. No other load. One of them is 20-30% faster than the other, very consistently. I used dstat to figure out, if there are more context switches, IO, swapping or anything, but I see no reason for the difference. With the same workload, (no swapping, virtually no IO), the cpu usage and load is higher on one server. So the difference appears to be mainly CPU bound, but while a simple cpu benchmark using sysbench (with all other load turned off) did yield a difference, it was only 6%. So maybe it is not only CPU but also memory performance. I tried to figure out if the BIOS settings differ in some parameter, did a dump using dmidecode, but that yielded no difference. I compared /proc/cpuinfo, no difference. I compared the output of cpufreq-info, no difference. I am lost. What can I do, to figure out, what is going on?

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• Desktop stops working in Windows 7

  - by Roger

  I'm having an odd problem on one of my Windows 7 machines. At machine startup, explorer.exe is working properly - I can use the Start menu, click on desktop icons, etc. At some later point, though, I lose the ability to interact with desktop icons. I can't double-click to open files on the desktop, and I can't right-click to see the properties window. Oddly enough the Start menu still works properly, and I can still open an Explorer window into my desktop and access everything. I can get around the problem by killing explorer.exe and restarting it using Task Manager, but it's annoying to have to do this over and over. Does anyone have any ideas? I took a look at startup files with msconfig and didn't see any obvious problems. Any suggestions would be appreciated.

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• Installing ubuntu server as linux distro on dell server - what drivers will be missed

  - by Cookie

  Dell (via USC) unpacks specific drivers for both RedHat and Suse to use after installation on its servers. As Ubuntu server isn't officially supported, this clearly isn't happening for Ubuntu. Is Ubuntu server then running with native drivers? In that case, which drivers are native with Ubuntu, and aren't (e.g. are Dell replaced) with RedHat/Suse? Are dell optimized drivers available for Ubuntu somewhere? Can the ones for RedHat or Suse be used with Ubuntu? Are there disadvantages of this lack of fine-tuned drivers, and if yes, what are they? Would they make the switch (and extra costs, as both RedHat and Suse Enterprise aren't cheap) away from the free Ubuntu server worthwhile? Dell recommends Canonical's commercial support for Ubuntu server on its machines, is this recommendable? Do they offer fine-tuned Dell drivers to replace native drivers?

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• Windows 7 persistent remote desktop

  - by jjedwardsja

  I have a Windows 7 x64 machine that I remote desktop into. The problem I have is when I log into the machine it loads the desktop fine. Once I close the remote desktop (no official log out.) and then log back in it reloads the desktop. I want it to preserve the session I was working in last time rather than resetting the session. This is a headless machine so I log in initial and always from a remote machine.

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• use ubuntu from a removable drive to work both on laptop and desktop computer

  - by moragos

  my laptop, which i run ubuntu on, is getting a bit old and i find it's getting slower and slower at running applications. My desktop computer is stronger, but I can't give up on the portability of my laptop. I was thinking of installing a HD drawer for both my laptop and desktop. and when I come home just pull the HD from the laptop and plug it into the desktop. I wanted to ask if anyone have tried it or have any inputs on the idea

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• How to Configure Ubuntu’s Built-In Firewall

  - by Chris Hoffman

  Ubuntu includes its own firewall, known as ufw – short for “uncomplicated firewall.” Ufw is an easier-to-use frontend for the standard Linux iptables commands. You can even control ufw from a graphical interface. Ubuntu’s firewall is designed as an easy way to perform basic firewall tasks without learning iptables. It doesn’t offer all the power of the standard iptables commands, but it’s less complex. HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• Why Ubuntu Server asks to insert a CD-ROM when installed from PXE?

  - by MainMa

  I set up a PXE server which hosts both Ubuntu Desktop and Ubuntu Server. Ubuntu Desktop is installed successfully from PXE. Ubuntu Server seems to successfully load vmlinuz and initrd.gz, asks for the language, then the location, then the keyboard layout, and finally complains that it can't mount the CD-ROM: The content of /var/lib/tftpboot/pxelinux.cfg/default is the following: default ubuntu-installer/amd64/boot-screens/vesamenu.c32 menu title Ubuntu setup label ubuntu-14.04-desktop-amd64 menu label ubuntu-14.04-desktop-amd64 kernel ubuntu-14.04-desktop-amd64/vmlinuz.efi append initrd=ubuntu-14.04-desktop-amd64/initrd.lz root=/dev/nfs boot=casper netboot=nfs nfsroot=192.168.1.41:/exports/ubuntu-14.04-desktop-amd64 splash -- label ubuntu-14.04-server-amd64 menu label ubuntu-14.04-server-amd64 kernel ubuntu-14.04-server-amd64/vmlinuz append initrd=ubuntu-14.04-server-amd64/initrd.gz root=/dev/nfs boot=install netboot=nfs nfsroot=192.168.1.41:/exports/ubuntu-14.04-server-amd64 splash -- What explains the fact that it requests the CD-ROM and how to avoid it?

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• How to Setup Network Link aggregation (802.3ad) on Ubuntu

  - by Sysadmin Geek

  Do you need to pump large amounts of data to a multitude of clients simultaneously, while only using a single IP address? By using “link aggregation” we can join several separate network cards on the system into one humongous NIC. Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform] Access and Manage Your Ubuntu One Account in Chrome and Iron Mouse Over YouTube Previews YouTube Videos in Chrome Watch a Machine Get Upgraded from MS-DOS to Windows 7 [Video] Bring the Whole Ubuntu Gang Home to Your Desktop with this Mascots Wallpaper Hack Apart a Highlighter to Create UV-Reactive Flowers [Science]

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• how to start LXDE session automatically after tightvncserver starts to make me able see desktop when connecting to the host via vncclient?

  - by Oleksandr Dudchenko

  I have system which is equipped with Intel Celeron processor 1.1 GHz s370 with 384 Mb of RAM on Intel d815egew motherboard which supports wake-on-lan function. I want to use such a PC for Internet sharing to the local network. Also this PC is a DHCP+DNS server as well as router/gateway. Based on above I decided to install Lubuntu as it is lightweight system. I installed Lubuntu 10.04.4 LTS from alternate ISO. System has no auto login. System boots and has acceptable performance. Host PC has onboard 4 network adapters: eth0 – ethernet controller which is used for Local Network connections. Has static address 10.0.0.1 eth1 – ethernet controller which is not used and not configured so far, I plan to connect printer here later on. eth2 - ethernet controller which is used to connect to Internet, which we plan to share for the local network wlan0 – wireless controller, it is used in role of access poit for local Network and has address 10.0.0.2 We want to control our gateway remotely. So, we need to be able to power it on remotely. To allow this I’ve done the following things: $ cd /etc/init.d/ made a new file with command $ sudo vim wakeonlanconfig Wrote the following lines to the newly created file, saved and closed it #!/bin/bash ethtool -s eth0 wol g ethtool -s eth2 wol g exit Made the abovementioned file executable $ sudo chmod a+x wakeonlanconfig Then included it into autostart sequence during boot. $ sudo update-rc.d -f wakeonlanconfig defaults after system reboot we will be able to poweron system remotely. Than we need to have a possibility to connect remotely to the host via SSH and VNC. So, I installed following packets with the following commands: $ sudo apt-get update $ sudo apt-get install openssh-server tightvncserver Add ssh daemon into autostart sequence during boot. $ sudo update-rc.d -f ssh defaults Power off the host PC $ sudo halt Then I went to remote place, send magic paket and powered the Host up. System started... And I connected to the host via Putty from remote system under Windows. Than logged in and run the command to start vnc server. $ tightvncserver -geometry 800x600 -depth 16 :2 VNC server successfully started and I got message like follows. New 'X' desktop is gateway:2 Starting applications specified in /home/dolv/.vnc/xstartup Log file is /home/dolv/.vnc/gateway:2.log Using UltraVNC Viewer programm under windows I connected to the host's vnc server, enterd the password and.... sow only mouse cursor in form of cross on a grey background of 800x600 dots, no desktop. Here is my .vnc/xstartup file #!/bin/sh xrdb $HOME/.Xresources xsetroot -solid grey #x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" & #x-window-manager & # Fix to make GNOME work export XKL_XMODMAP_DISABLE=1 /etc/X11/Xsession The Question: What I have to change and where to make LXDE session start automatically after tightvncserver starts?

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• HTG Explains: What AppArmor Is and How It Secures Your Ubuntu System

  - by Chris Hoffman

  AppArmor is an important security feature that’s been included by default with Ubuntu since Ubuntu 7.10. However, it runs silently in the background, so you may not be aware of what it is and what it’s doing. AppArmor locks down vulnerable processes, restricting the damage security vulnerabilities in these processes can cause. AppArmor can also be used to lock down Mozilla Firefox for increased security, but it doesn’t do this by default. How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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• computer shows up twice, connection unknown

  - by Thomas G. Seroogy

  added two computers to Ubuntu One. One machine is windows. The windows version seems to work fine, and I started syncing a folder by placing it into the Ubuntu One folder. All files and folders are visible when I go to my account online. On Ubuntu machine. I selected to sync the Download folder. Shortly thereafter, I realized that one folder exceeded my storage max. I tried to un-sync the folder, but Ubuntu One and the Stop Syncing This Folder were not visible in the menu. Per Ubuntu instructions, I removed my Ubuntu computer from the list of syncing computers. Per Ubuntu instructions, I re-added the Ubuntu computer. However, I find that two computers by the same name are added on both the desktop app and on the web. Plus, I the connection is "unknown." I have removed and re-added the computer several times with the same results. In all cases, I remove the computers using the Ubuntu One desktop app, then removing them from my account on the web, removing the Ubuntu One password, and restart the Ubuntu One app. Problem remains. Thanks in advance for any replies and help.

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• How do I connect to Ubuntu One after changing the password?

  - by rumtscho

  I changed my password for Ubuntu One using the Web interface, and added a new computer. Since then, the old computer does not synchronize with Ubuntu One. It doesn't show any error messages or such, but files uploaded from the web interface or changed on the newly added computer don't appear/change on the old computer. I guess that it can't connect because it is still using the old password. The problem is that I can't find an interface to change the password the client is using to connect to the service. The "manage account" option opens the Web interface. I looked into the keyring, and found the key for Ubuntu One, but there I only see an encrypted version of the password, so I can't change it there. So what is the correct way to tell my client that my account password has changed? Edit this is what I see when I open Preferences -- Ubuntu One. Is there something wrong with it? It also stubbornly insists that it has successfully synchronized. But the files I have added from other computers are not in my Ubuntu One folder.

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• Why I cannot mount ISO file from this .desktop file by `fuseiso`?

  - by Kevin Dong Nai Jia

  I want to mount iso files without root permission by fuseiso, and this is how to mount a iso file: fuseiso -p '/path/to/isofilename' '/media/isofilename' , so I make a .desktop file followed Freedesktop Standard (The Exec key) as bellow: #!/usr/bin/env xdg-open [Desktop Entry] Name=Mount ISO image Name[zh_TW]=??????? Exec=fuseiso -p %U "/media/$(basename %U)" Terminal=false MimeType=application/x-cd-image , but it failed. I think it failed because of $(basename %U), if it is changed to a fixed string, the iso file can be mounted. How can I solve this problem?

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• how can I update my Firefox 4.0 beta in Ubuntu 11.04 natty 64bit ?

  - by Denja

  Hi community, I'm using Ubuntu 11.04 natty 64bit with the integrated Firefox 4.0 beta Firefox 4.0 is not yet stable as beta and has lots of bugs when I open mainly Java applications in the web.Usually it freeze and even mess with Ubuntu gnome panel. It seems I cannot find any PPA related with Firefox beta updates in my Software source . How can I update my Firefox 4.0 beta in Ubuntu 11.04 natty 64bit?

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• 8 New Features in Ubuntu 12.10, Quantal Quetzal

  - by Chris Hoffman

  Ubuntu 12.10 has been released and you can download it now. From better integration with web apps and online services to improvements in Unity, there are quite a few changes – although none of them are huge or groundbreaking. The list of new features may be more exciting next time around, with Mark Shuttleworth promising secret development of new “tada!” features that will be unveiled closer to Ubuntu 13.04’s release. Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

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• How to connect ethernet on ubuntu (with auto-detection by Ubuntu)

  - by user12285

  Do I need to post another thread for the same? If so, sorry. Yes, I saw that it's been well over six months but I have the same router SmartAX MT880d with ethernet, and the exact same problem, that is no internet even though I can successfully reach the modem settings page by entering 192.168.1.1 in Firefox. Sorry if I don't use the right (technical) terminology to express my issue. English is not my mother tongue. I'm a total beginner with ubuntu. My internet works great in Windows but does not work in Ubuntu. For 2 weeks, I've kept reading on the web and forums and the ubuntuguide.org to name a few but to no avail. Now I see no other solution but to ask for help. My problem is that as a beginner, I can't find a way to put the right digits in the right place because I don't know what numbers I need to put in what files (eg: do I need to use DHCP? or a static IP address? No clue whatsoever. I'm confused between putting figures in the wrong spaces. For example, is the modem/router's IP exactly 192.168.1.1 for Huawei Smart AXMT880d modem?? Is the subnet 255.255.255.0? Gateway 192.168.1.1. I'm confused as I can also see a different IP starting with 155131*** (is it an account number? no clue again) on my contract with Huawei (a Chinese ISP). Apart from calling 911, what other numbers do I need to put in and where? How do I check that all the numbers have been entered correctly in every appropriate space before trying to connect the Internet?

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• WIN7 and Ubuntu lost after Installing ubuntu 12.04 and win7 dual system ,I have no OS on my laptop now

  - by abos

  Here is the procedure: In the morning I installed ubuntu using a USB directly without config any thing to my win7 system. After install complete, ubuntu installation software tell me to reboot.And everything is just find. While rebooting, there is NO UBUNTU system for me to select,and my laptop go straight to log in using WIN7. NO ubuntu shows on WIN7's configuration(Default System). Log in ubuntu using usb(try ubuntu without installation), I can find ubuntu's filesystem was already there. Formatting the disk on WIN7's disk management, rearranging them to other disk.Still having no trouble with WIN7. In the afternoon try a few times of installation and uninstallation of ubuntu. still shows no sign of selecting ubuntu system. In the evening another trial while installing ubuntu with the third option of: installing ubuntu alongside with INW7, erase win7 and install ubuntu. somethingelse --- my check failed with configuartion for what comes out with the 'something else' option,reboot. And I have no system now with some cmd tips say: Reboot and Select proper Boot Device or Insert Boot Media in selected Boot device and press a key. Files those on win7's orginal file system and Ubuntu filesystem can still be found when I 'try ubuntu without installation'. 5.But I just got no OS when I reboot my laptop normally.

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• Can I place the Ubuntu One for Windows home sync folder anywhere on C:\ during installation?

  - by vonshavingcream

  My company does not allow us to keep personal files inside our personal folder. Something about the roaming profiles getting to large. With Dropbox I am able to set the destination of the folder during the install. Is there anyway to tell Ubuntu One where to put the Ubuntu One folder? I don't want to add external folders to the sync list, I just want to control where the installer creates the Ubuntu One folder. Otherwise I can't use the service :(

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• Are there statistics or time series of open bugs in Ubuntu?

  - by aroque

  I would like to know how the number of bugs in Ubuntu (open, closed, critical, etc) has evolved with time. It's a sort of scientific curiosity I have, but it would also give me a feeling how the community has changed over time, how it has coped with the challenges (I think of Unity in particular) and what's its status now. Has anyone collected these data over the years? If yes, are they publicly available? I know this information can be gathered from Launchpad itself and actually I found a website that had data from mid 2008 to early 2009. I found Ubuntu live stats, which shows live messages related to Ubuntu, but does not aggregate bug statistics. Finally there are some stats on the Ubuntu Weekly Newsletter but they only show diffs of bugs closed during the last week.

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• Why not sync folders outside home with Ubuntu One?

  - by peer

  It took me a while to find out that with Ubuntu One I can sync only folders in my home folder. On all other folders the Ubuntu One option is available in preferences, but the actual actions are greyed out. The Ubuntu One FAQ is quite clear on that: No, currently you can only select to synchronize folders inside your home directory. But I actually wonder why and if this is going to change and if there is a trick around it (an other one than setting my home to /) ? I personally don't have any important data in my home folder other than the program configs. All documents, pictures, music are on a folder called /data that is actually on a different partition. That makes it much easier when one wants to reinstall Ubuntu.

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• Flowmotion Running on Ubuntu Server [migrated]

  - by Thomas Egan

  I am trying to configure Flowmotion to work on my Ubuntu Server. At present I use LAMP to serve pages from a Virtualbox installation. I will be moving this to a dedicated server but would like to enable true streaming of videos using this installation. I am only interested in open source streaming for a research project and although I have installed Flowmotion via apt-get I don't know how to start the service so that embedded videos located on the server will stream. Can anybody provide any information regarding this or online resources I may have missed? I have checked the documentation however if appears far too complex. Just clarify I'm running VirtualBox 4.2.1 on Mac OSX 10.6.8 and Ubuntu Server 12.06 64-bit

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• Does "Ubuntu for Android" (12.04) work with the Samsung Galaxy S2?

  - by Charles Hadeed

  I'm trying to buy a new Android phone and I own an Ubuntu 12.04 computer... I have the choice of a Google Galaxy Nexus, Samsung Galaxy S2, and a HTC Sensation XL. I am aware that the HTC already works with it but i would prefer to buy the samsung. I already have the phone hardware specifications and have checked but i am not sure with the samsung or the nexus. So which of these phones work for Ubuntu 12.04's 'Ubuntu for Android' feature?

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• How to install Ubuntu One server software or alternative for personal use?

  - by lastpak

  I have a Debian based box in my house that runs as a webserver, and a 4GB bootable usb-stick with Ubuntu. I need to store stuff on a server and Ubuntu One seems an ok way to go but I find that 2GB is not sufficient. I can most likely solve that when I install this server software. Where can I find it - there is no ubuntu-one-server package or similar in the Software Centre. How can I install the Ubuntu One server software or an alternative?

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• How can I choose a different Ubuntu One default local folder?

  - by hellpe

  I would like to tell Ubuntu One to sync with '~/Public/Ubuntu One' rather than '~/Ubuntu One'. Since I'm using it on Arch Linux, I don't have any right-click option for that. I tried to edit ~/.config/ubuntuone/syncdaemon.conf and add the line root_dir = ~/new/folder (as suggested in this thread), but the file is automatically reverted to its previous state. Also, the command u1sdtool hangs and does apparently nothing - I have to use Ctrl + C to close it. Is there another way to setup the default Ubuntu One default local folder?

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• Cannot boot into Ubuntu after installing Ubuntu 12.04 (with Windows 7 on another partition)

  - by onezanygirl

  I just installed Ubuntu on my desktop which had Windows 7 installed on it. When I restart the machine after completing the installation, It directly loads windows, I don't see the grub menu. I tried using boot-repair using the LiveCD (both recommended fixes AND fixing the MBR), it did not help. What am I missing? I have done this at least 5 other times, on different machines, and have never faced this issue before.

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