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

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21 views

How should I debug a hard-lockup of my Ubuntu laptop

I've been running Ubuntu on a Thinkpad T450s for some time now. Every so often, the system will hard-lock on me. E.g. the mouse won't move, ctrl-alt-f# won't take me to a plain terminal, etc. I ...
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0answers
14 views

Where are the logs from sensord saved and how to get sensord working?

I want to control the logs of sensord because my PC autonomously rebooted. lm-sensors is already installed and I found that sensord should log the sensor values to syslog, see here. Unfortunately, it ...
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0answers
24 views

steps to troubleshoot bluetooth dongle?

How do I troubleshoot, or at least gather more data in order to troubleshoot, a bluetooth dongle? In particular, from the CLI. On a lower level, I can see the bluetooth hardware: thufir@mordor:~$ ...
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0answers
20 views

Kali 2 interrupted installation problem

I'm new to dual booting with Kali 2 and Windows 10 and I was wondering if you can help me out with my problem: The problem is that i encountered this error: error: file '/boot/grub/i386-pc/normal....
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0answers
19 views

Troubleshoot routing in rewrite/virtual host

I don't want a solution as much as a way to find the problem. I am learning networking mostly because it interests me and I set up something in my uncle's restaurant. It looks like this. A soft AP ...
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0answers
26 views

Creating initramfs

I was doing a lab on a machine whose initramfs was removed. I regenerated it by following command for latest kernel on that machine dracut -f initramfs-versionoflatestkernel.img ...
3
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1answer
63 views

Lots of missing files in debsums output

I run debsums -cs in a machine running Debian Jessie. The output is lots of missing files. Lots of them (maybe all) has some sort of locale two letters code (like zh, fr, de, and so on). I have run ...
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1answer
19 views

Reinstall Debian, keep conf and programs [closed]

I am having trouble to login on the GUi (gdm3). I can login in a prompt in this machine and connect to the internet (it's a fast connection). Could I just run a command and reinstall the system and ...
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1answer
42 views

Dealing With A System Which Is Not Letting To LogIn Due To Open Permissions [duplicate]

A colleague of mine told me that after he executed the below command, he's not able to login to the system. No user can login via ssh. Only normal users can login over physical console of the system,...
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0answers
22 views

Xpdf Config File Not Being Read

According to the documentation for xpdf, the user-level config file is supposed to be stored at ~/.xpdfrc. I've done that, but xpdf seems to not be reading it on startup. I say this because I set up ...
1
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1answer
36 views

Verify why a process went down accidentally on Solaris 11

I want to know what reasons could have caused a process to be killed automatically by a system or taken down. What file do I need to verify, or how do I know why the process crashes accidentally? Is ...
0
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1answer
29 views

Troubleshooting a yum update that breaks gnome

Recently yum update gave me about 130 packages to update (mostly connected with upgrading from GNOME 3.8 to 3.14 on Scientific Linux 7). I installed the updates, which went fine, but after logging ...
1
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1answer
63 views

Machine freezes once it hits swap space under heavy load

I encountered several crashes of my machine. Meanwhile, I can reproduce it when I start a program that fills up all memory. Once the system starts writing to the swap file, the system freezes and I ...
2
votes
1answer
102 views

Network interface issue after upgrading CentOS 6 to 7

Recently I have upgraded my VM Server from CentOS 6 to 7. The upgrade completed without any error but the network interface is not showing in ifconfig and there is no file called ifcfg-eth0. Before ...
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0answers
56 views

Kali Linux no wifi accesss

I have recently installed Kali Linux from a USB boot on my MacBook Pro. I cannot seem to connect to my wireless network. I have traveled across numerous message boards trying to find a solution. One ...
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0answers
25 views

Nothing happens after clicking “install packages” in Linux Mint

On a new installation of Mint 17.3, I'm getting a problem when I try to install packages. After clicking "install packages" and inputting the admin password, nothing happens. No errors, nothing. I ...
0
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1answer
45 views

Graphical issues installing Linux Mint

I'm trying to install Mint on a desktop and I'm having some issues getting it to cooperate. When I run from the Live DVD and allow it to start automatically, I get this on the screen: If I select ...
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0answers
14 views

Dell E6500 auto dimm sensor not working under Linux

I have a problem with my Dell Latitude E6500 under Linux. My Ambient Light Sensor doesn't work under Linux,but on GRUB and BIOS it works perfectly. BIOS upgrade to the newest for that notebook haven't ...
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3answers
631 views

When using vi typing a “c” will delete a character

This also happens when copying and pasting. I am attempting to edit Go code and typing or copying and pasting "package main" comes out as "pkage main". No idea why I can't type a c. Pressing delete ...
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0answers
243 views

How to figure out why Linux crashes

Every so often, my laptop will crash. The screen will freeze, including the cursor, the lock lights (caps lock and the like) will turn off if they were on, though my battery, power, and wifi lights ...
2
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0answers
38 views

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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0answers
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
34 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 ...
1
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1answer
380 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 ...
2
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1answer
3k 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
85 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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0answers
346 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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0answers
56 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 ...
0
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1answer
299 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
8k 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 ...
0
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1answer
226 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 ...
2
votes
1answer
209 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
1k 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
111 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 ...
2
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0answers
597 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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1answer
1k 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 ...
1
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1answer
246 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
2k 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 ...
1
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1answer
99 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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2answers
47 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 ...
1
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1answer
421 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 ) ...
1
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1answer
1k 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 ...
0
votes
1answer
1k 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 (...
3
votes
1answer
285 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
34 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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0answers
419 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
225 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 '{ ...
6
votes
1answer
6k 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 ...
3
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1answer
166 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 ...