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  • Is it possible to remove a particular host key from SSH's known_hosts file?

    - by Kaustubh P
    I usually end up deleting the entire known_hosts file, which I have no problems for. But just out of curiosity, Is it possible to remove just a single entry? I opened the known_hosts file, and other han understanding that the file contains fingerprints for a given machine, I dont understand anything. Below is the message I faced, which led me to ask this question. Add correct host key in /home/wissen16/.ssh/known_hosts to get rid of this message. Offending key in /home/wissen16/.ssh/known_hosts:1 RSA host key for foo.com has changed and you have requested strict checking. Host key verification failed. Thanks.

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  • One click access to bookmarked files?

    - by dunderhead
    On my Windows machine with just one click I can launch favourite or bookmarked files that I use on a daily basis, which is a great time-saver. Is there any way to do this with 11.10 Unity? Ideally I would like to right-click on an icon in the launcher and have a list of files appear that I could then left-click to launch, but I'd be happy for any simple solution. Please note that I am not referring to recently used files lists - these do not work at all because the bookmarked file will always drop off the bottom of any recently used file list.

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  • How can I optimize my development machines files/dirs?

    - by LuxuryMode
    Like any programmer, I've got a lot of stuff on my machine. Some of that stuff is projects of my own, some are projects I'm working on for my employer, others are open-source tools and projects, etc. Currently, I have my files organized as follows: /Code --/development (things I'm sort of hacking on plus maybe libraries used in other projects) --/scala (organized by language...why? I don't know!) --/android --/ruby --/employer_name -- /mobile --/android --/ios --/open-source (basically my forks that I'm pushing commits back upstream from) --/some-awesome-oss-project --/another-awesome-one --/tools random IDE settings sprinkled in here plus some other apps As you can see, things are kind of a mess here. How can I keep things organized in some sort of coherent fashion?

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  • Text reverses on remote gnome session

    - by Andrew Stern
    I have two computers running 10.4 . The first machine is a wired desktop with sshd. The second is a wifi connected laptop with the ssh client. When I use my laptop to bring up a remote gnome session to my desktop all the text gets reversed. Steps: 1) login as a user on the laptop to activate the wifi with a stored key. 2) goto a console Ctrl-Alt F1 3) do a xterm -- :1 to bring up a blank graphic session 4) ssh -Y user@desktopmachine gnome-session This shows reversed text and messes up the keyboard so I can't type

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  • More about JuJu cache

    - by koxon
    I would like to know more about JuJu cache. After I start a charm and JuJu provisions a machine for the first time, the charm will be downloaded and all dependencies installed (apt-get, etc). This process can be very long. Once the charm has been build, configured and deployed once, can JuJu provision more instances of the same charm pre-built and configured? I presume that's what the cache is for, but the documentation is not very explicit: https://juju.ubuntu.com/docs/charms-deploying.html How JuJu tracks the state of the charm if it works that way? Thanks Nic

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  • Behavior tree implementation details

    - by angryInsomniac
    I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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  • Why can't I ping server? VMware set to 'Bridged' loses IP address

    - by Dave
    I have installed a fresh 10.04 server onto a laptop on a home network as a VMware machine and set network connection to 'Bridged: connect directly to the physical network' from within VMware and rebooted the server. It then loses its IP address. dhclient eth0 says "No working leases in persistent database - sleeping" DHCP is working fine on the wi-fi router. The laptop is wired to a wireless router and from there wirelessly to a desktop. Desktop and Laptop can ping each other from Windows. I can ping the VM from Windows on the same laptop, but not from the desktop. Strangely ping has started to resolve hostnames to IPv6 addresses and not IPv4. Don't know whether that's connected? A kick in the right direction would be greatly appreciated. I've been an Ubuntu desktkop user for a few years, but new to ubuntu servers.

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  • Ubuntu 12.04 desktop crash [closed]

    - by David Mannock
    12.04 is stable under a light load, but not under intensive use of Gaussian 09 vB1. Looks like a heating issue, but psensor says that all is well on 32-cores @56C. Similar results for 64 cores. Machine shuts down after 2-3h. Syslog shows shut down. Whoopsie crash reporter sends in report. After 259 updates on the weekend, I am left wondering what the heck is wrong with this release? My answer would be "EVERYTHING!". Can someone help me do some systematic checks on this OS and hardware.

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  • what exactly is system programming?

    - by kentjh
    I have never understood what system programming meant. The usual definition given is "...doing something close to the Os or extending Os features...". Does using Windows API directly rather than some libraries to say do file i/o make it system programming? Was writing Android OS system programming? If I write something that would expose linux kernel through a console like app on Android am I doing system programming? If I am writing software to control a washing machine am I writing system programming? I am a beginner in programming and this is confusing me to no end. Please explain contrasting it with "application programming".

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  • How do I apt-get -y dist-upgrade without a grub config prompt?

    - by fratrik
    Per Make apt-get (or aptitude) run with -y but not prompt for replacement of configuration files? I did the following: ec2run ami-3c994355 --region us-east-1 -n 1 -t m1.large -z us-east-1d On the machine: sudo apt-get update sudo apt-get -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" dist-upgrade I still get a prompt asking me which config file I want to use. These are the lines that come before the prompt: Setting up grub-pc (1.99-21ubuntu3.1) ... then: +-------------------------------------------------------¦ Configuring grub-pc +-------------------------------------------------------+ ¦ A new version of configuration file /etc/default/grub is available, but the version installed currently has been locally modified. ¦ ¦ ¦ ¦ What do you want to do about modified configuration file grub? ¦ ¦ ¦ ¦ install the package maintainer's version ¦ (Unrelated, was this too much information?)

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  • dnsmasq not running

    - by Yevgeniy M.
    i installed ubuntu 12.04 on a netbook with 16GB SSD. To keep the installation small i used the mini.iso i got from here. Everything worked fine, but i noticed that dnsmasq does not get started by NetworkManager. On a different machine i installed 12.04 from a regular iso and netstat shows dnsmasq running and listening on port 53. NetworkManager.conf look identically on both systems. The line dns=dnsmasq is present. Although i do not really need dnsmasq - name resolution works fine without - i would like to know the reason why dnsmasq is running on one system, but does not run on the other and how i could adjust this behavior. Thx in advance!

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  • How can I configure updates in a CMS like WordPress?

    - by Varsha
    I have a CMS built in core PHP. Till now, if a new version is released, it is downloaded to client machine in zipped form. And then client has to manually unzip the folder and copy that to required location. Because there is no way to download zip file to required location. I want that CMS should be updated in the background like-WordPress. In other words, I want that new version can replace old version. How can I do this?

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  • Insane load average after reboot

    - by Gazzer
    After doing a reboot of Ubuntu server 12.04 LTS (after an apt-get dist-upgrade) my server load (on a 16GB) machine goes insane (around 80) for about 10 or 15 minutes The only things I can think of are these two processes: /usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf --skip-column-names --batch -e ? select concat('select count(*) into @discard from `',? TABLE_SCHEMA, '`.`', TABLE_NAME, '`') ? from information_schema.TABLES where ENGINE='MyISAM' /usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf --skip-column-names --silent --batch --force -e select count(*) into @discard from `information_schema`.`PARTITIONS` Is this normal?

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  • I want to learn how to help or contribute to Unity

    - by user17953
    I am a college student studying computer science and would one day like to work on operating systems. The part of ubuntu that really interests me is Unity and I would like to study it and possibly contribute to it. I was reading the wiki pages about it and it was saying to get a copy of all the required components and then start hacking. Would it be wise to do this in a virtual machine with ubuntu on it? Do you have any advice on a good place to start? Do you know of any common pitfalls? Should I also post in the irc for this? Thanks

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  • ubuntu 14 painfully slow on dell r200

    - by sirmonkey
    I didn't notice it at first. The machines (there is 20 plus) are to be used a simple file servers. It wasn't until samba just wouldn't act right that I installed a desktop gui and started more diagnoseing the problem did I catch the slow preformance... I've tested 4 servers they all suck. And windows 7 runs fantastic on them. I have Google and searched. But nothing to explain this. The easy test is dmesg is so slow you can almost read it. I'm guessing it's an apic or cpu power management issue. What output would you all like????? It is a core2 machine with 4Gb of ram. On board data.

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  • The Apple iPad &ndash; I&rsquo;m gonna get it!

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Well, heck, here comes another non-techie blogpost. You know I’m a geek, so I love gadgets! I found it RATHER interesting to see all the negative news on the blogosphere about the iPad. The main bitch points are - No Multi tasking No Flash Just a bigger iPhone. So here’s the deal! My view is, the above 3 are EXACTLY what I had personally hoped for in the Apple iPad. Before the release, I had gone on the record saying - “If the Apple Tablet is able to run full fledged iTunes (so I can get rid of iTunes on my desktop, I don’t like iTunes on Windows), can browse the net, can read PDFs, and will be under $1000, I’ll buy it”. Well, so, the released iPad wasn’t exactly like my dream tablet. The biggest downer IMO was it’s inability to run full iTunes. But, really, in retrospect, I like the newly released iPad. And here is why. No Multi tasking and No Flash, means much better battery life. Frankly, I rarely multi task on my laptop/desktop .. yeah I know my OS does .. but ME – I don’t multi task, and I don’t think you do either!! As I type this blogpost, I have a few windows running behind the scenes, but they are simply waiting for me to get back to them. The only thing truly running and I am making use of, other than this blogost, is media player playing some music – which the iPad can do. Also, I am logged into IM/Email – which again, iPad can do via notifications. It does the limited multitasking I need, without chewing down on batteries. Smart thinking, precisely the reason I love the iPhone. I don’t want a bulky battery consuming machine. Lack of flash? Okay sure, I can’t see Hulu on my iPad. That’s some loss. I can see youtube. Also, per Adobe I can’t see some porn sites, which I don’t want to see on my iPad. But, Flash is heavy. Especially flash video. My dream is to see silverlight run on the iPhone and iPad. No flash = not such a big loss. Speaking of battery life – 10 hours is plenty. I haven’t been away from electricity for that long usually, so I’m okay with charging it up when it runs low. It’s really not such a big deal honestly. Finally, eBook functionality – wow! I went on the record saying, eBook readers are not for me, but seriously, the iPad is perfect for my eBook needs at least. And as far it being just a bigger iPhone? I’ve always wanted a bigger iPhone, precisely for the eBook reading experience. I love my iPhone, I love the apps on it. The only thing that sucks about the iPhone is battery life, but other than that, it is the best gadget I have ever bought! And something that runs on mobile chips, is that thin, and those newly written apps .. mail, calendar .. I am very very excited to get my iPad, which will be the 64gig 3G version. The biggest plus in an iPad ……… no contract on data. I am *hoping*, this means that I can buy a SIM card in Europe, and use the iPad here. That would be killer awesome! But hey, if I had to pick downers in the iPad, they would be - - I wish they had a 128G Version. Now that we have a good video viewing machine, I know I’d chew up space quickly.- Sync over WIFI, seriously Apple.  Both for iPhone and iPad.- 3 month wait!!- Existing iPhone users should get a discount on the iPad data plan. Comment on the article ....

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  • Torrent clients suddenly stopped downloading

    - by Vasilis Baltikas
    A few days ago I noticed, that Transmission in my Ubuntu 10.04 machine suddenly couldn't download anything anymore. To overcome this I have uninstalled and reinstalled Transmission and tried downloading with other clients (Deluge, Vuze) well seeded torrents (ubuntu iso images for example) without success. On the same computer I have also installed Ubuntu 10.10 and Windows 7, which I rarely use. What makes the problem I encounter weirder, is the fact that downloading via torrents works fine in my Ubuntu 10.10 and Windows partitions but not in Lucid Lynx. Browsing the web for similar problems didn't give me answers. Any help would greatly appreciated.

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  • Torrent clients suddenly stop downloading

    - by Vasilis Baltikas
    A few days ago I noticed, that Transmission in my Ubuntu 10.04 machine suddenly couldn't download anything anymore. To overcome this I have uninstalled and reinstalled Transmission and tried downloading with other clients (Deluge, Vuze) well seeded torrents (ubuntu iso images for example) without success. On the same computer I have also installed Ubuntu 10.10 and Windows 7, which I rarely use. What makes the problem I encounter weirder, is the fact that downloading via torrents works fine in my Ubuntu 10.10 and Windows partitions but not in Lucid Lynx. Browsing the web for similar problems didn't give me answers. Any help would greatly appreciated.

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  • Wheres my memory going?

    - by Stu2000
    My machine keeps 'freezing' before eventaully logging out with all the programs exiting. This is rather annoying, and I think its because I keep running out of memory. I am not running any custom software, just netbeans, chrome etc. (Stuff I usually run on other ubuntu computers without issue). For some reason my memory usage is through the roof as seen here, but I can't quite figure out why. Here is a screenshot which may be useful with htop and gnome-system monitor open as user and as root. I notice that my console-kit-daemon is taking up about a gig of 'virtual memory'. Is that normal? Any tips/advice will be helpful. In the meantime I have ordered 2 x 4 gig ram sticks to try and just throw hardware at the issue.

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  • SQL Auto Close Options

    - by Dave Noderer
    Found an interesting thing that others have run across but it is the first time I’ve seen it. A customer emailed to say that the SQL 2008 db that I had helped him with seemed to be going into recovery mode on a regular basis while watching the SQL Management Studio screen. Needless to say he was a bit nervous and about to take some drastic steps. Eventually he found that the Auto Close option was set to true. When this is set to true, the database automatically closes all connections and unlocks the mdf file after 300 milliseconds. When a new connection is made it spins backup… Great for xcopy deployment on a client machine but not a multi-user server based application. So the warning… if you have started a database with SQL express and then move it to a production SQL server, make sure you check that the Auto Close option is set to false. See options screen below:

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  • How Byte loading/storing is implemented By the CPU?

    - by AlexDan
    I know that in 32bit machine, cpu read from memory 32bits at a time. since the registers in this case is 32bit in size too, I can understand how this works. What I don't understand is how the cpu implement load instructions of 1 byte. does it load the whole word where the single byte is located to the register, then perform some kind of "byte shifting", or does the cpu can load a single byte, in this case when does the byte masking happen, is it until the byte got loaded in the register, or it happen when byte is send through the data bus ? P.S. The cpu Im using is MIPS, the instructions Im talking about are: lb or lbu

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  • HD Video Peformance Unacceptable

    - by Mike Hasselbeck
    Was wondering if anyone could help me boost HD 1080p video performance on my machine? I've got an AMD Athlon X2 Dual Core processor, 2 gb RAM & an ATI Radeon 5450 video card. I've installed the latest ATI Catalyst drivers, I installed the hardware acceleration things and linked them (I believe) to VLC. Still, it's still not running as well as I would like. Any thoughts or suggestions? Any help would be much appreciated. Thanks!

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  • how to launch grub menu for ubuntu guests in virtualbox?

    - by Ubuntuser
    I have ubuntu 12.04 alpha installed in virtualbox. When the virtual machine is started, it boots directly to the login screen without showing the grub menu. How can I get the grub menu to show up on start? Please note: the graphics is broken after recent updates, so i cannot login and make the changes. it is stuck at the screen "Ubuntu is running on low graphics mode" and the mouse and other keys do not work. [URL=http://img862.imageshack.us/i/screenshotat20120127171.png/][IMG]http://img862.imageshack.us/img862/9783/screenshotat20120127171.th.png[/IMG][/URL]

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  • Ubuntu partitions on Dell XPS13

    - by Francois
    I bought a Dell XPS13 with ubuntu 12.04 pre-installed. I want to reformat and repartition the machine but as I'm far from being a linux guru, I'm afraid to erase something important that could have been preinstalled by Dell. On the disk, there are 3 partitions: /dev/sda1 - Ext4 Linux bootable 248GB - witch is the system+user partition I guess, /dev/sda2 - Extended (?) of 8GB - What is this partion about? /dev/sda5 - Linux Swap of 8GB - whitch is for RAM and need to be reconduct (why only 1xRAM and not 2?) Do I have to care about /dev/sda2 ? According to you can I reformat to create a partition for /home whitout losing anything important (except user data of course) ? Thank you for your help

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  • Can a partition table be edited from a LiveUSB of another architecture?

    - by Eliran Malka
    My purpose is to re-partition a dual-boot machine (running Ubuntu 13.04 / Windows 7), i.e. the current table is as follows: ----------------------------------------------------------- | | extended partition | | | windows |--------------------------------| recovery | | (NTFS) | swap | filesystem | (NTFS) | | | (swap) | (ext4) | | ----------------------------------------------------------- and I want to create an additional ext4 partition under the extended partition, and mount those (the one I created and the 'filesystem' partition) to root and home (/ and /home), such as the new layout will be: ----------------------------------------------------------- | | extended partition | | | windows |--------------------------------| recovery | | (NTFS) | swap | root | home | (NTFS) | | | (swap) | (ext4) | (ext4) | | ----------------------------------------------------------- As the installations on the system and on my Live USB differ in architecture, I want to know: Is it safe to use a 64bit GParted from a Live USB for partitioning a 32bit installation?

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