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

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2
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1answer
13 views

Reinstall Debian, keep conf and programs

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 ...
0
votes
1answer
38 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 ...
0
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0answers
9 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
vote
1answer
27 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
votes
1answer
17 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
vote
1answer
34 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 ...
1
vote
1answer
631 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?
19
votes
7answers
55k 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 ...
1
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1answer
70 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 ...
0
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0answers
42 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 ...
0
votes
0answers
12 views

Package installation problem

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
votes
1answer
28 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 ...
0
votes
0answers
12 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 ...
5
votes
3answers
623 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 ...
2
votes
0answers
515 views

can't open netbeans IDE in Fedora 17

my linux version is: Fedora 17 I installed Netbeans IDE 7.1.2 and it was working fine, but now, when I try to open it, nothing happens after double clicking on it. I think updating the kernel may be ...
0
votes
0answers
50 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 ...
1
vote
0answers
168 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
votes
0answers
35 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) ...
0
votes
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. ...
3
votes
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
vote
1answer
299 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
votes
1answer
2k 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 ...
0
votes
2answers
68 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 ...
0
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0answers
316 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 ...
0
votes
1answer
246 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 ...
2
votes
2answers
5k 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 ...
1
vote
1answer
166 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 ...
0
votes
1answer
185 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 ...
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
votes
2answers
471 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 ...
1
vote
1answer
210 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 / ...
4
votes
2answers
959 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 ...
0
votes
0answers
98 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
votes
0answers
519 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. ...
4
votes
2answers
5k 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 ...
1
vote
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
vote
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 ...
15
votes
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
vote
1answer
92 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 ...
6
votes
3answers
5k views

Remote-Accesible Live-Distribution (aka Live CD)

I'm looking for a live distribution (Live CD or the likes) which comes - per default - with sshd running at startup. I want to check the components of my laptop whose graphics has died ...
1
vote
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 ...
0
votes
1answer
399 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 ) ...
7
votes
1answer
1k views

What would cause “crossover” between two USB2 webcams when using motion?

I am using the Motion package for linux to act as a security system with two Microsoft LifeCam HD-5000 webcams. In general it's working very well but I'm experiencing a weird issue. Every now and then ...
12
votes
3answers
5k 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 ...
1
vote
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 ...
3
votes
1answer
265 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 ...
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 ...
8
votes
2answers
10k views

console-kit-daemon Hogging CPU and RAM

We have a system that's been a bit sluggish. top reports that console-kit-daemon takes anywhere from 18-30% CPU and about 50% memory. There are only two users logged in, one on X and one via ssh. Any ...
1
vote
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 ...
0
votes
0answers
366 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: ...