Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

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How to determine what event is disabling Sticky Keys?

I have an ongoing problem with Kubuntu 14.10, when using the computer I find that Sticky Keys is suddenly disabled. I reenable the feature, but in after some time (measured as three minutes to days) ...
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9 views

Live Media that tells me where a (regular) boot gets stuck?

I can't reboot my system, even after restoring from a backup it gets stuck during the boot process. It does not show any boot log while booting, and nobody has ever found a way to make it show. ...
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2answers
23 views

Can resource over-utilization actually cause users to be unable to SSH to Linux?

The night support guys where I work have a tendency to reboot machines citing the fact that they can't ssh in and figure out what's going on in the first place. It's pretty much against company ...
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1answer
24 views

sendmail attachment is empty

I am trying to include an attachment to my sendmail eml file. The current eml file (order.eml) has the following contents From: Sender <sender@email.com> To: client@email.co.za Subject: Report ...
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1answer
47 views

Restarting all the network in Ubuntu after hibernating

When my Ubuntu 14.04 machine awakes from hibernation, sometimes the network is disable and enabling it does not make it work again. Running sudo service network-manager restart alone does not solve ...
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2answers
25 views

Possible fix?: ICEauthority Error With a Systemically limited File Permission Issue

First off, I would like to apologize ahead of time for such a completely absurd accident to happen to my computer. Essentially I wanted to change my Cinnamon-mint theme on linux. But I noticed that ...
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62 views

Fedora 21 Samba Share Troubleshooting

I've recently upgraded my server's OS from CentOS 6 to Fedora 21. I understand there have been a bunch of new changes regarding the SystemV vs SystemD updates but I cannot get my Samba share to work ...
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31 views

No login window display on debian

I am using Debian GNU/Linux 7.8 (wheezy) operating system in my institute. Yesterday I put a MATLAB program on a different machine from mine using ssh to run, which takes hours. Today morning when I ...
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1answer
40 views

Intermittent Network disconnection, Ubuntu, troubleshooting help

I purged network manager from my system (OS: Linux 3.13.0-53-generic #89-Ubuntu) Networking service runs on my system: sudo service networking status networking start/running Static interface ...
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2answers
172 views

How to detect, find and install a missing firmware [duplicate]

Context Today I installed Debian 8 on my HP Pavilion Notebook PC, during the installation (specifically during the network setting up), the the system prompted: Hardware needs non-free firmware to ...
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1answer
82 views

CentOS 6 apcupsd Trouble Shooting

I'm having issues with the recommended UPS monitoring software apcupsd. It installed ok but when I run it and check the error messages it is getting spammed with all these messages and doesn't seem ...
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1answer
56 views

wifi slowdown after time, how to troubleshoot

I do not currently have access to the computer with the issue, to I am sorry if this question is a bit vague. I only need to know how to troubleshoot and not the actual solution. Right, I have a USB ...
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2answers
210 views

My /var/log/ is mysteriously filling up GBs in minutes! Any cure before I re-install Debian 7?

Good morning, fellow *nix enthusiasts! I have been using Debian 7 for a while now and after a recent upgrade I noticed I constantly kept running out space on my root partition. I mean to the point ...
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0answers
56 views

OpenVPN Connect from a Different Network

I recently setup OpenVPN on a CentOS 6 machine. The setup went smooth and I can connect to it fine from a client computer when both computers are on the same network. I wanted to know how to make the ...
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0answers
207 views

Why am I losing audio on VLC when playing HQ videos?

I am having a problem with VLC when I play HQ videos (720p and higher): when I try to look for a particular scene (say I am playing a movie and want to get to go to 30 minute mark) the sound goes off. ...
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16 views

Trouble booting with Gnome

I have an HP Pavillion g6 Notebook PC that came pre-installed with Windows 8. I didn't particularly like it and ended up installing the latest version of Gnome on it instead. Since then, whenever I ...
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1answer
400 views

Can I do reverse traceroute?

Is it possible to do reverse traceroute ? This is very important for me to know, Why the websites are loading slow for my clients in certain area ? I have explained my problem here: (why i need ...
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1answer
100 views

traceroute / mtr from multiple locations, How can we do it ? (Or alternate way)

I have a website, recently due to some network issue, Most of my customers are reporting slow loading time of my website. When I reported this to my DataCenter, they are asking me to send the ping / ...
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3answers
645 views

Troubleshoot SSH connection problem

I am looking for tips on how to troubleshoot a problem with connecting to a new server via SSH. I am trying to connect using private-key authentication, where SSH uses my local private key to ...
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2answers
2k views

Why do my identically prepared USB sticks differ in one byte?

I have two identical USB sticks (TrekStor 16GB) prepared as following with the c't bankix image. Preparation using GParted: Deleted the existing partition Created a new DOS partition table ...
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1answer
59 views

In which directory is node running?

In trying to figure out how some application that listens on port 8088 is running, I see that it has PID 15020: $ netstat -ntulp Proto Recv-Q Send-Q Local Address Foreign Address ...
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0answers
293 views

How to troubleshoot: “X11 connection uses different authentication protocol.”

I start an ssh session with localbox % ssh -vvv -Y remotebox 2>debug_ssh_log ...which succeeds. Then I try to run xlogo on remotebox, but the command fails immediately, and the following lines ...
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2answers
45 views

how to troubleshoot on whether a file system had actually been unmounted or not.?

We have a server on which, a couple of days before we got an alarm continuously everyday, that a file system has been unmounted. But when we logged into the server the file system is still there ...
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1answer
275 views

Ubuntu on macbook won't boot from USB

I cannot boot Ubuntu from my macbook. I have tried the official Ubuntu walkthrough for creating a USB boot stick (located here: http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-mac-osx ) ...
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1answer
677 views

How do I troubleshoot ssh tunnels disconnection?

I am using SSH tunnels launched via autossh at boot on a device installed at remote locations. Up to now everything was working fine but yesterday the connection partly went down and autossh wouldn't ...
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1answer
816 views

Gallium renderer used instead of Intel Mesa

I have got GPU (Intel Haswell HD4600) performance troubles on my Debian. I installed driconf, because I read it can help. When I ran it from my user account I saw my default renderer is Gallium ...
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1answer
177 views

How to get correct scan codes for my laptop keyboard without pressing a key?

I have a problem with the keyboard of my laptop which doesn't work properly anymore. However I have full control of the laptop via ssh. The problem is that I use a self encrypting disk (Samsung 840 ...
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1answer
31 views

Language variable missing after the update

It appears that language variable is missing after our recent update to our Linux servers. We are running Redhat 5 on them. Is there anyway update can remove variables? The env output shows nothing ...
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227 views

Root able to login but non root users are denied - PAM

One of our servers is not letting non-root users login, but root can login without any issues. The following are the messages from /var/log/secure: Jun 24 18:08:43 jonnserver sshd[14470]: debug1: ...
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1answer
105 views

How to prevent xdotool from locking the current window after a script?

I have a simple BASH script with xdotool, that reads some data from a CSV, and enters it into a form in some other software: #!/bin/bash sleep 5 while read -r line do a="$(echo $line | awk '{ ...
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0answers
132 views

Ubuntu displays Shutdown window then turns off system

Some weeks ago, I've downloaded unetbootin both Windows and Linux versions to make a startup Ubuntu USB. I was going to use it to rescue my damaged Ubuntu partition. Tried the Linux version but didn't ...
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1answer
5k views

Why can I not see some files in my USB stick on Windows that I can see on Linux?

I'm having a little problem with my USB stick. There are files and folders on the USB stick I can see and manipulate on my Linux machine (Fedora 20) but some of those files and folders appear nowhere ...
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1answer
109 views

How to interpret the following pattern of uptime data?

I have a small web server running mysql and wordpress which after a while appears to stop processing web requests. I can't even log into the server via ssh as ssh client times out when trying to ...
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157 views

Stuck/hung upon connect usb device

I have a device the is coming up 'busy' as soon as I plug it in. I even sniffed the usb connection and all looks normal. How do I find out what is capturing the device? How do I free it up? ...
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1answer
207 views

How to know what is trashing my Linux mint system?

My linux system is trashing occassionally. I have 4 GB of ram which is good even for Windows 8. All in all I have good specs. But occasionally the HDD light in the CPU is on for a long time and at the ...
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80 views

Network connecting trouble shooting

I am trying to connect to the network of my school. With Windows 7 + IE it is not problem at all. I connect to it, no matter what web-page I try to reach, I get forwarded to ...
3
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2answers
355 views

Unblanking a Linux Terminal Display

I am running an Ubuntu Server that boots to the console. After a long wile, the screen goes blank and I cannot type or unblank the screen. Even the caps lock / num lock do not change states. I am ...
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4answers
550 views

Is there a way to circumvent normal installation proceedures and manually install (M1400 Motion Computing Tablet)

TLDR version Can I install Linux by booting the Live CD and then doing a dd if=/ of=/dev/hda? Can I somehow install Linux by copying files off of the installing ISO directly onto the harddisk drive? ...
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1answer
237 views

Computers are restarting spontaneously and simultaneously, how do I find the cause?

I have two computers that spontaneously shut down and rebooted (this happened more than once), both are identical hardware and were installed from the same image (CentOS 5). They are controlling some ...
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1answer
59 views

Is there a general rule for tracking an error?

I would like to start with an example here just to make it easy to convey my question. I have uncommented the following line from the /etc/pam.d/su file auth required pam_wheel.so use_uid thus ...
2
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1answer
740 views

How to boot Chromium OS verbosely?

I'm attempting to boot the latest Chromium OS 32-bit build from this site. Whilst I'm currently experiencing a typical installation issue (stuck at a black screen after initial loading screen), not ...
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2answers
9k views

No MAC corresponding to IP in `arp` table: how to troubleshoot?

I've got a Debian 7 linux machine and a TP-link MR3020 router attached to it via ethernet cable at eth0 interface, working in WISP mode meant to make it a client rather than an access point: I also ...
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3answers
4k views

Trim with LVM and dm-crypt

I tried to setup TRIM with LVM and dm-crypt on ubuntu 13.04 following this tutorial: http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/ See the ...
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1answer
143 views

Troubleshooting internet connectivity

Recently I see that I often lose internet connectivity on my Linux machines. I am starting to think that it may be a router problem, but I have no idea to check if this is indeed the problem. ...
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2answers
4k views

Mate desktop breaks with no panels and tens of caja windows on user switching?

I'm using Sabayon GNU/Linux with Mate-Desktop. I have my computer set up for multiple users so my girlfriend and the kids can use it too. ~ $ uname -a Linux 3.9.0-sabayon #1 SMP Thu Jun 27 07:53:45 ...
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5answers
171 views

Difficulty setting up iptables

I'm very new to *nix operating systems, and I'm having some trouble which I believe is because of misconfiguration of the iptables firewall. My server has SSH running on port 22, and server software ...
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2answers
1k views

User data in evince and cups

Some days ago my evince stopped printing. After reinstalling it and trying different versions without success I figured out that it works from other user accounts on the same box. So which files ...
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7answers
38k views

Why is USB not working in Linux when it works in UEFI/BIOS?

For background I have just built a new machine with modern hardware including: AMD FX-8350 Gigabyte GA-990FXA-UD3 motherboard 16GB RAM NVidia GTX 650 Ti Kingston SSD Given that, I tried to install ...
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1answer
464 views

How to troubleshoot high kernel time (high network usage; high interrupts)

I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
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131 views

Null byte files in duplicity backup

When duplicty encounters 0-byte-files it gives an IO-error: Error [Errno 5] Input/output error ... getting delta for ... The files are usually some wired stuff like ...