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  • Switching mdadm to an external bitmap

    - by Oli
    I've just read this in another post about improving RAID5/6 write speeds: After increasing stripe cache & switching to external bitmap, my speeds are 160 Mb/s writes, 260 Mb/s reads. :-D I've already found out how to increase the stripe cache and this worked pretty well but I'd like to know more about an external bitmap. I have an incredibly fast (540MB/s) RAID0 SSD that would do well if a bitmap does what I think it does but I'm still very unsure. I've only known about them as long as I've known this post. A few questions: What is a bitmap (in terms of mdadm)? What are the advantages of an internal bitmap (over external)? What are the advantages of an external bitmap (over internal)? How do I switch between the two? I should add that while this is a I'm-bored-let's-break-something thread, I do value the data stored on the RAID array. If doing this is going to put data at significant risk, please let me know.

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  • How to remove space between application and workspace switcher on Unity launcher?

    - by Tyler Marengo
    I just downloaded Ubuntu 11.10 for the first time. I really enjoy the launcher on the left hand side but have a problem. After playing around with adding applications in it, there are large spaces from the last application to workspace switcher. If I try to drag a new application into the launcher everything moves farther down, instead of filling in the space in between apps. When I right click on the launcher in a blank spot it reads "drop to add application." I'm looking for a way to have all of the applications close together with no spaces, like when I first downloaded Ubuntu.

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  • After upgrade to xubuntu 12.10 I have 2 mount points for each partition

    - by TiGR
    Just upgraded Xubuntu 12.04 to 12.10 (both XFCE and LXDE desktops are being used at this system). Now I have 2 mount points for each partition. It looks like this: It appears this way in both Thunar and PCManFM. However, there are no dupes in Nautilus. $ ls /dev/disk/by-id/ ata-ST320410A_5FB3MA76 ata-ST3250620A_9RT030B0-part3 scsi-SATA_ST320410A_5FB3MA76-part1 scsi-SATA_ST3250620A_9RT030B0-part4 ata-ST320410A_5FB3MA76-part1 ata-ST3250620A_9RT030B0-part4 scsi-SATA_ST320410A_5FB3MA76-part2 scsi-SATA_ST3250620A_9RT030B0-part5 ata-ST320410A_5FB3MA76-part2 ata-ST3250620A_9RT030B0-part5 scsi-SATA_ST320410A_5FB3MA76-part3 scsi-SATA_ST3250620A_9RT030B0-part6 ata-ST320410A_5FB3MA76-part3 ata-ST3250620A_9RT030B0-part6 scsi-SATA_ST3250620A_9RT030B0 scsi-SATA_ST3250620A_9RT030B0-part7 ata-ST3250620A_9RT030B0 ata-ST3250620A_9RT030B0-part7 scsi-SATA_ST3250620A_9RT030B0-part1 scsi-SATA_ST3250620A_9RT030B0-part8 ata-ST3250620A_9RT030B0-part1 ata-ST3250620A_9RT030B0-part8 scsi-SATA_ST3250620A_9RT030B0-part2 ata-ST3250620A_9RT030B0-part2 scsi-SATA_ST320410A_5FB3MA76 scsi-SATA_ST3250620A_9RT030B0-part3 $ ls /dev/disk/by-uuid/ 01CD9E239FDF54F0 5299-430B 8824C9E324C9D3FA b05c582e-77df-4b83-8a75-17db1ab5dbc1 09a9cf9e-6af4-45ed-a9ac-782c764fe8d1 6bbd501e-7601-4ee7-b725-d3ec7f19f149 8B7C-BAF8 f54ee301-4bd4-40e3-a9fb-75ca79c05974 50366CC66E8BA293 8553dc4a-5d63-4078-9be3-ea91a46d8c67 a5be1bcd-b7c6-4273-8ade-eb9cce15504d There are no SCSI drives in this system. What could cause this problem? Is it a bug?

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  • Why won't my code work in Ubuntu Server 11.10? Is it because of gd library?

    - by Derrick
    I get this error when running the following code: No such file found at "widgets/104-text.png" I know that the code works because it works on my other non-ubuntu server. I do not know if it is gd library or what. I tried both the bundled version and the non-bundled and both do not make this code work. $con = mysql_connect("localhost","user","abc123"); if (!$con) { die('Could not connect: ' . mysql_error()); } mysql_select_db("satabase_name", $con); $productid2 = $this->product->id; $thename = mysql_query("SELECT * FROM pshop_product_lang WHERE id_product = '$productid2' LIMIT 1"); $thename2 = mysql_fetch_array($thename); $string2 = $thename2['name']; $string = (strlen($string2) > 25) ? substr($string2, 0, 25) . '...' : $string2; $font = 4; $width = imagefontwidth($font) * strlen($string); $height = imagefontheight($font); $image = imagecreatetruecolor ($width,$height); $white = imagecolorallocate ($image,255,255,255); $black = imagecolorallocate ($image,0,0,0); imagefill($image,0,0,$white); imagestring($image,$font,0,0,$string, $black); imagepng($image, 'widgets/' . $productid2 . '-text.png'); $getimg110 = mysql_query("SELECT * FROM pshop_image WHERE id_product = '$productid2'"); $gotimg110 = mysql_fetch_array($getimg110); $slash110 = addcslashes($gotimg110[id_image], '\0..\999999999999999999999'); $str110 = str_replace('\\', '/', $slash110); $newimg110 = '<img src="img/p' . $str110 . '/' . $gotimg110[id_image] . '-large_default.jpg" />'; include("conf.inc.php"); include('ImageWorkshop.php'); // Initialization of layer you need $pinguLayer = new ImageWorkshop(array( 'imageFromPath' => 'widgets/background.png', )); $pinguLayer2 = new ImageWorkshop(array( 'imageFromPath' => 'img/p' . $str110 . '/' . $gotimg110[id_image] . '-large_default.jpg', )); $pinguLayer3 = new ImageWorkshop(array( 'imageFromPath' => 'widgets/' . $productid2 . '-text.png', )); // resize pingu layer $thumbWidth2 = 150; // px $thumbHeight2 = 150; $thumbWidth = 400; // px $thumbHeight = 200; $pinguLayer2->resizeInPixel($thumbWidth2, $thumbHeight2); $pinguLayer->resizeInPixel($thumbWidth, $thumbHeight); // Add 2 layers on pingu layer $pinguLayer->addLayerOnTop($pinguLayer2, null, null, 'LM'); $pinguLayer->addLayerOnTop($pinguLayer3, 70, 25, 'MM'); // Saving the result in a folder $pinguLayer->save("widgets/", $productid2 . ".gif", true, null, 95); The file path is correct, however this part of the code is not creating the image as it is supposed to: $thename2 = mysql_fetch_array($thename); $string2 = $thename2['name']; $string = (strlen($string2) > 25) ? substr($string2, 0, 25) . '...' : $string2; $font = 4; $width = imagefontwidth($font) * strlen($string); $height = imagefontheight($font); $image = imagecreatetruecolor ($width,$height); $white = imagecolorallocate ($image,255,255,255); $black = imagecolorallocate ($image,0,0,0); imagefill($image,0,0,$white); imagestring($image,$font,0,0,$string, $black); imagepng($image, 'widgets/' . $productid2 . '-text.png');

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  • How to change Port 27000 from filtered to open status

    - by Nadarajah Ranjan
    In my ubuntu box I am running flexlm licensing software on port 27000 and I am able to pull the license from the this port to run the simulation software locally. I am also trying to run the same software in another Linux machine (opensuse) by using the flexlm license from the Ubuntu box. However, my opensuse box is unable to communicate with port 27000 in my Ubuntu box. I have turned off the firewall on the Ubuntu box, played around with iptables and when I do a nmap from my opensuse box to Ubuntu box the message I get is that port 27000 is on filtered status. My understanding is that filtered status does not allow the opensuse box to communicate with Ubuntu. My question is how to change port 27000 from filtered status to open status? Hope someone can help me out. Thank you.

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  • Laptop not syncing with Ubuntu One

    - by Lolwhites
    I have a desktop running Maverick, and a laptop running Lucid. Both are supposed to be linked to my Ubuntu One account. The desktop syncs fine, but when I started the laptop for the first time in a couple of months, it wouldn't sync any more. The Ubuntu One Preferences window either reports "Synchronisation complete" even though no recent files have been downloaded nor have any test files created in the relevant synced folder been uploaded, or it says "Synchronisation in progress", which does not appear to be happening as it stays like this for ages and the lights on my router suggest no traffic is going through. Have repeatedly tried disconnecting and reconnecting, and removing the device from the account then reattaching it, all to no avail.

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  • mounting linux partition after installing windows

    - by varsketiz
    I installed windows 7 and my grub is gone. I'm trying to follow: https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows but I can't mount my ubuntu partion. sudo fdisk -l Device Boot Start End Blocks Id System /dev/sda1 * 1 13 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 13 4863 38958080 7 HPFS/NTFS /dev/sda3 4864 14594 78157825 5 Extended /dev/sda5 14220 14594 2999296 82 Linux swap / Solaris Gparted shows my Extended partition as empty/unallocated space (???). How can I mount it? sudo mount -t ext3 /dev/sda3 /media/ubuntu mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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  • Using versioning for settings in home?

    - by maaartinus
    I planned to use git for the important files in my home directory, so I can revert bad settings or transfer them to another computer as needed. But there's too much chaos there, with each program mixing wildly temporary files, caches, logs, backups, and everything. Finding anything worth saving is hard, and when I've found any settings done by myself, there were mixed with informations specific to the computer (so I could hardly take them to another one) and timestamps (so tracking useful changes is hard). Is anybody doing it or is it just hopeless? How to filter out the garbage?

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  • Notifications not working in Gnome 3.4

    - by chazdg
    Notifications are no longer working in Gnome 3.4 but they are working in Unity. I have tried everything I can think of but I am stumped. To clarify, I am changing the theme using Gnome Tweak. Themes were obtained from various repositories including noobslab/themes and webupd8. As an example, when using the default theme adwaita, I get all notifications when using Rhythmbox as to what song is being played on an internet radio station. I even tried a different media player with the same result. When I change the theme, all I get is a media player Icon. Change back to default theme and all Notifications work fine. Notifications were working at first with all themes, but no longer. The question is how to get Notifications to work for all themes. They did for previous versions of Gnome-shell.

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  • Native AAA games coming to Ubuntu. Where they will be installed?

    - by user86274
    Many users use SSD disks (and I believe many more in the future) for their OS. 128GB SSD disks are common place nowadays and many users (like me) use their SSD for dual booting (Windows and Ubuntu). Ubuntu installations like this occupies 20-40 GB (/ , /home and swap). Up to now there was no problem. In a few weeks though, triple A games are coming to Ubuntu (i.e. l4d2) that require probably tens of GB for installation. In windows there is no problem, because you can install a game anywhere you want (i.e. I install games in D:/Games/). In Ubuntu, though, programs install files in many places (i.e. /usr/* , /lib, /etc ) so from what I remember, I never had the option to choose where to install a program. So, how will it be possible to install AAA games that require many GBs, when our Ubuntu installations won't have the necessary space? Could a /opt mounted on a mechanical disk (HDD) be the solution? Is it something I am missing?

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  • How to make Gmail open when clicking mailto: links in the same browser it is clicked in under Unity Ubuntu 12.04?

    - by max
    I just installed 12.04 and when clicking mailto: links Thunderbird opens. I want Gmail to open in the browser that the mailto: link is clicked. So if I am in Firefox and click a mailto: link a new FF tab opens with Gmailloaded. And if I am in Chrome and click a mailto: link then a new Chrome tab opens up with Gmail loaded. Is there a way to do this via some script? Or would I need to set this in some system settings?

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  • How do I *temporarily* change the *console* keymap to dvorak?

    - by John Baber
    I type dvorak, but I don't like to confuse other users by having it be a system-wide default. I have a script that runs setxbmap dvorak that I can call when I want dvorak and likewise another script that runs setxbmap us when I want qwerty. For X, that's fine. How do I get this behavior in the real console (Ctrl-Alt-F3)? i.e. how can I change the console keymap to dvorak without setting a system-wide default. Having to sudo to do it is fine, but it can't be the default keymap for any console user. Resources like this and this seem to be explaining how to permanently alter the system but I need to change it on the fly temporarily. In BSD this was possible by using wsconsctl.

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  • Is chroot the right choice for my use case?

    - by Anthony
    Backstory: I am working on setting up a MineCraft server and want to allow admins to have ssh access to the MineCraft server console and appropriate mc server files, but not the whole system. The console provided by the minecraft server is only available to the user that launched the process. In addition, the admins will need terminal access to some basic cli tools such as wget, cp, mv, rm, and a text editor. Plan: I have already setup the ssh aspect of things, requiring pre-shared keys and whatnot. Setup a jailed environment in which all user activity will be contained. Setup user accounts. - The first user account will be the minecraft user. The minecraft user will start the MC server in a multiuser screen session and allow the other admins to attach to it. - Subsequent users should have their own /home directory for normal usage. Setup acl for the appropriate files to allow each user to edit the mc server files. No one will be doing system updates, nor will anyone be installing any programs, so I'll be the only user with sudo. The Issues: I don't want the ssh users to have access to the whole system. Users will still need to use wget or curl to update the mc server files. Is chroot the right tool for this use case, or is there something more appropriate for the job? I have no experience setting up a chroot environment and have found several tools to aid in this process. Jailkit seems to be the most robust, but it's not in the standard repos.

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  • How to adjust the appearance of the Unity in 12.10?

    - by piedro
    Now I updated to 12.10 and would like to adjust the desktop, well unity, appearance. I know there is the theme setting, but I cannot adjust the symbol theme or windows decoration with the systemsettings. I used to use the tool "unsettings" but it doesn't work with 12.10 anymore. Ubuntu Tweak used to be an option but at this point many features are broken and a lot of settings seem to mess up my system or they don't change anything at all (I understand that there has been a design settings change - gsettings, dconf, something ...) myunity has some options to change stuff but I couldn't find it for 12.10 ... not to forget "gnome-tweak-tool" which seems to work for most settings but not for all, e.g. it doesn't change the mouse cursor and the windows decorations do not show some decorations I'd like to use and I am also afraid of messing things up because it is supposed to be used in gnomeshell ... actually as I found out right now it really messes things up: fonts get inverted, suddenly high contrast accessibility setings are used in some windows, nautilus has white fonts on white background and even the login manager is a mess now ... So: How can I adjust the theme, symbol, decorations, fonts for the normal user and for the desktop and for the applications including the applications started as sudo user? I should mention that I upgraded from 12.04 and that some applications like synaptic completely ignore any settings ... sadly it is a mess, there was a time when gnome theming was really well done and very adjustable, I wonder what happened ... Just now I read that further development of Ubuntu Tweak has been stopped. The developer announced that he won't go any further with the software and the online services ... That is sad and destroys my hope for easy appearance editing just by waiting ... has been such a nice tool for 12.04 ... r.i.p.

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  • Find out if there is a local user logged in when logging in over ssh

    - by sebastiangeiger
    I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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  • Building own kernel on ubuntu

    - by chris
    Hi, I'm trying to build my own kernel, as I want to write a kernel program which I need to compile into the kernel. So what did I do? Download from kernel.org, extract, do the make menuconfig and configure everything as needed, do a make, do a make modules_install, do a make install and finally do a update-grub. Result: It doesn't boot at all.... Now I had a look here and it describes a different way of compiling a kernel. Could this be the reason whz my way did not work? Or does anyone else have an idea why my kernel doesn't work? ######## Edit Great answer, ty. Oli. But I tried it the old fashioned way, and after one hour of compiling I got this message: install -p -o root -g root -m 644 ./debian/templates.master /usr/src/linux-2.6.37.3/debian/linux-image-2.6.37.3meinsmeins/DEBIAN/templates dpkg-gencontrol -DArchitecture=i386 -isp \ -plinux-image-2.6.37.3meinsmeins -P/usr/src/linux-2.6.37.3/debian/linux-image-2.6.37.3meinsmeins/ dpkg-gencontrol: error: package linux-image-2.6.37.3meinsmeins not in control info make[2]: *** [debian/stamp/binary/linux-image-2.6.37.3meinsmeins] Error 255 make[2]: Leaving directory `/usr/src/linux-2.6.37.3' make[1]: *** [debian/stamp/binary/pre-linux-image-2.6.37.3meinsmeins] Error 2 make[1]: Leaving directory `/usr/src/linux-2.6.37.3' make: *** [kernel-image] Error 2

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  • How can I repair a corrupt kernel if no others are installed?

    - by Willi Ballenthin
    I've been running Ubuntu 10.04 on my laptop for quite some time. When I went to boot it up this morning, BAM! kernel panic (which immediately lead to human panic) when loading the kernel. So I've spent much of the day troubleshooting, and my current theory is that the FS is fine, but that the kernel image may be corrupt. Let's go with this current theory for the sake of this question, as I am interested how it is done. How can I replace the kernel image if I have no bootable kernels? Can I boot to a 10.04 live CD, copy the the vmlinuz-2.6.3x... to the HD and go from there? Wouldn't I want to copy the initramfs as well, but configured for the desktop system? Can I generate this from the live CD?

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  • Unable to run curl on on Ubuntu11.10

    - by ryy
    I ran : sudo apt-get install curl libcurl3 libcurl3-dev php5-curl Put: extension=php_curl.so in both /etc/php5/cli/php.ini and /etc/php5/apache2/php.ini But running php from the command line gives me the following error: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/php_curl.so' - /usr/lib/php5/20090626+lfs/php_curl.so: cannot open shared object file: No such file or directory in Unknown on line 0 Running the install commands again tells me that everything is already the newest version. Running: locate php_curl.so Returns nothing.

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  • What does this rule mean

    - by Kenyana
    When I run $ sudo iptables -L This is what I get Chain INPUT (policy ACCEPT) target prot opt source destination REJECT tcp -- anywhere anywhere tcp dpt:www flags:FIN,SYN,RST,ACK/SYN #conn/32 > 20 reject-with tcp-reset Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination What does this mean? I am pretty new to the whole Ubuntu world. I cannot access webmin at times, keep getting The connection has timed out error.

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  • Can not enter password for sudo [duplicate]

    - by Michael
    This question already has an answer here: add repository to ubuntu from terminal with pgp key 3 answers I have used Ubuntu for several years, and I can not enter password for sudo, and this is when i wanna add a key to public.gpg for itunes10 it dos not work, and the password normal works wite sudo but not in the terminal when i enter: sudo wget -q "http:// deb.playonlinux.com/public.gpg" -o- | sudo apt-get add - and it says this 'sorry try again', and i just had installed itunes10, and have to add a key whit wget to public.gpg, and i tried to enter in the terminal: sudo apt-get update and the password works fine but not whit using sudo wget, and can some one please help.

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  • 12.10 on Elitebook 8560w w/ WUBI

    - by iSeth
    I am trying dual boot Windows 7 and Ubuntu on my Elitebook 8560w via WUBI. Between Microsoft and HP they used up all my primary partitions so I decided WUBI was the best way to go. It all goes smoothly until I reboot to finish the installation, then it hangs at copying files. It always freezes here: debconf (filter): widget found for ubiquity/install/title debconf (filter): -- 0 OK It also says something about "so and so might freeze best to kill it" but I didn't get it written down. Can anybody tell me what that means? EDIT: This is what it says (In Full): ubuntu kernel: [365.130914] [<c1064d607] ? kthread_freezable_should_stop+0x60/0x60 ubuntu kernel: [365.130914] [<c15d04fe7] kernel_thread_helper+0x6/0x10 debconf (filter): <-- progress set 49 debconf (filter): widget found for ubiquity/install/title debconf (filter): -- 0 OK debconf (filter): <-- progress set 50

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  • Having troubles installing Ubuntu using Wubi

    - by Torsten
    I am trying to install Ubuntu on My Toshiba laptop, it is a 64 bit system and is running windows 7 I keep on getting this error Error executing command command=C:\Users\A'den\AppData\Local\Temp\pylA524.tmp\bin]resize2fs.exe -C:\ubuntu\disks\root.disk17744M recal=1 stderr= stdout=resie2fs 1.40.6 (09-Feb-2008) Usage: /cygdrive/c/Users/Aden/AppData/Local/Temp/pylA524.tmp/bin/resize 2fs.exe-f C:/disks/root.disk 17744M [-d debug_flags] [-f] [-F] [-p] device [new-size] and the log file reads

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  • Lubuntu 13.10 selected LX games desktop now can't login

    - by user111667
    I logged out of my normal desktop and selected LX games from the dropdown list and logged back in. This led me to a black screen and now I can't see the login screen in order to change back to my normal desktop. On startup the machine boots normally, the lubuntu splash screen shows up, then it goes to a black screen with nothing on it - not even a mouse cursor. I can bring up a terminal using ctrl+alt+F2. Is there a way via terminal to change my desktop environment back to its previous state? Or alternatively, is there a file I can edit where my preferred desktop is stored? (The machine is dual-booted so I can access the Lubuntu files from LXLE which is installed on a second partition). The machine in question is a Toshiba A200 laptop.

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  • Why can't tuxboot and ubuntu play well together?

    - by mmr
    I'm trying to get clonezilla to run off of a usb stick, and it seems that the right way to do that is via tuxboot. Tuxboot is not compilable on ubuntu. I used git to get it from the repository, and then when I run the 'install' script (because building it is apparently not allowed, since the build script just tries to install windows things). Qmake-linux wants my qmake executable to be in the same directory as the stuff I pulled down, and let's just say that if there's a way to do this easily, I ain't seein' it. So then I download the linux file, the most recent of which is tuxboot-linux-25. Try to run it, get a failure that libpng12.so.0 isn't found. OK, then I go to install that via the instructions I found on the web but firefox seems to have already deleted from my history (yay!) Then I add the /usr/local/lib directory to ldconfig via emacs (had to install that too, of course): http://ubuntuforums.org/showthread.php?t=369848 I still get the errors that libpng12.so.0 cannot be opened because 'No such file or directory'. ldconfig -p | grep libpng shows that the library is there, but it still doesn't seem to be findable. What to do next? (for the record, doing this in windows is painless-- download, click, and it's done. But I'm trying to be all linuxy and get away from Windows for this...)

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  • HP DL360 G4 screen resolution problem

    - by dogmatic69
    I just bought an old blade server to mess about with at home and cant get the thing to work. I have run the installer 11.10 x64 server and that was fine. After installing and rebooting, POST is fine but when grub kicks in the screen shows a popup type box complaining that it cant use the resolution. I have tried different screens and its always the same. I can reboot and go back into the installer and the screen is fine. I tried to follow some guides on-line about changing the resolution but I cant get a terminal. I found one in the installer but that is using the ram as /. the installer says 'the drive is mounted as "/target"' but I don't see that, nor /mnt/target. Could anyone help me configure this and get it running. Thanks.

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