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

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27 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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35 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
18 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
36 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
272 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
37 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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0answers
52 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
83 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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0answers
64 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 ...
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1answer
194 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
316 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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0answers
66 views

Problems installing Linux Mint

I tried to install Linux Mint 15 on my PC using a bootable USB. I had partitioned a drive on windows for the linux. But while installing from the bootable, I cannot see the partition. I am afraid I ...
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1answer
114 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
56 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 ...
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1answer
286 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
2k 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
1k 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
90 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
2k 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
154 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
531 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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5answers
12k 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
213 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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0answers
85 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 ...
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2answers
458 views

Backup to a synology NAS with bup

I am trying to make a remote backup to my Synology NAS (DSM 4.1) using bup. I compiled bup on my NAS from source, did there: BUP_DIR=/volume1/public/Backups/bup bup init Initialized empty Git ...
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2answers
3k 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 ...
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1answer
235 views

Encfs error: `/bin/umount: unrecognized option `--no-canonicalize'`

I just installed encfs from source on a synology disk-station (DSM 4.1) and it seems to work fine. But when I try to unmount my encfs directory via fusermount -u I get the error message: fusermount ...
2
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1answer
136 views

Diagnose unplanned shutdowns

I have a problem with a server that is shutting down for some unknown reason. I check the logs each time it happens and cannot find anything of particular interest which would suggest why its going ...
3
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1answer
138 views

Slow ecryptfs mount

If I create an encrypted share (internally done via ecryptfs) on a synology disk station DS109 (DSM 4.1), mounting is very slow (approx 40 seconds). It doesn't matter if I do it via the ...
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1answer
266 views

Killed `rm` and `cp` on nfs share

I am just testing an rsnapshot installation on my laptop which should backup to a NAS mounted via nfs on my laptop. On one test rsnapshot died with a cp -al problem (i.e. a problem with hard links) ...
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1answer
58 views

How might I detect memory errors if I do not have root or physical access to a Linux system?

The background to my question is as follows. I currently rent a virtual private server from a major hosting company, which I use to run a minecraft server. I have a suspicion that there may be bad ...
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1answer
2k views

Gnome 3 “broken” after upgrades, kind of looks like gnome 2 . . .?

I'm running debian wheezy ( testing ) and after some upgrades my gnome 3 is broken. It's not exactly broken, but it's completey different. Almost like it's no longer actually gnome 3; most of the UI ...
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1answer
177 views

Accidentally set /lib permissions to 644

Long story short, I've got an Ubuntu server box that was recently compromised (I believe through a known exploit of an older version of Tomcat, which has already been updated). Part of the exploit ...
2
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1answer
313 views

Problem with java3d

I want to play this java simulation: http://www.compadre.org/OSP/items/detail.cfm?ID=9640 in java 3d mode on a linux (ubuntu) system. But it doesn't work. If I switch to java 3d-mode it complains ...
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3answers
6k views

Linux network troubleshooting and debugging

From time to time Linux and Unix users faced with various network problems. Many of these problems are presented here and at some others troubleshooting forums, but the are very concrete and contains ...
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2answers
727 views

Debugging hanging bash process

After some bad performance today, I checked top: 1 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14229 myuser 20 0 8776 5264 1684 R 99 0.2 1383:47 bash 98-100% ...
6
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3answers
2k 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 ...
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0answers
400 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 ...
2
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1answer
2k views

how to troubleshoot a network adapter on an AIX 4.3.3 machine

I'm trying to brush up my skills on AIX. I have an ancient RS/6000 43P-133 which I'm trying to resurrect before investing in anything more sophisticated. I used to do automation and scripting on AIX ...
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2answers
118 views

Non-distro specific, linux tweaking, hacking and learning support IRC

Distro-specific support channels are good only if you run their clean stable versions out of the box and basically don't install anything other than what you get out of the box. But what about those ...
3
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1answer
1k views

Trouble booting CentOS

I switched from an Ubuntu to the CentOS yesterday. But it seems I have messed my installation somehow, since OS will only start correctly if the USB with the installation is plugged in. Long story: ...
2
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1answer
106 views

Missing entries from messages file

I have a CentOS server that has been working well until recently. The virtualized instance of the server encountered some type of issue earlier today and required it to be hard rebooted in order for ...
7
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1answer
226 views

Where should I look for error messages after a freeze-up and reboot in Linux?

I was forced to shutdown (using the power button) and reboot after my laptop froze with just a black screen. After such an incident, where should I look for error messages etc. that might indicate ...
3
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1answer
2k views

Why does my mouse stop working a short time into my session?

Running Easy Peasy 1.6 clean installation. Hardware - EEE PC 900-HA. About 10 or so minutes into a new session after a reboot my mouse will stop working. It will still move the pointer, but it will ...
4
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2answers
707 views

How to troubleshoot the old X applications working incorrectly on modern X servers?

I have an old X application provided as a part of a complicated signal processing package. The application resides on the display-less server, and clients having different X-servers connect to it. On ...
2
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2answers
54 views

How can I determine which service run during bootup is responsible for a certain behaviour?

On my Fedora 14 system, some strange bind mounts have appeared in the list of mounts. They appear on every bootup. I can unmount them with umount -l, but I would like to find which package is mounting ...
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2answers
440 views

Suggestions needed to debug why ps -ef gets stuck

A few of my processes consume 100% cpu. I'm trying to figure out which scripts are causing it I tried running strace ps -ef: open("/proc/PID/status", O_RDONLY) = 6 read(6, "Name:\textract\nState:\tR ...
3
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1answer
476 views

good unix troubleshooting book [closed]

I've been trying to learn *nix and I think I'm doing pretty good as far as basic commands, and I think I understand a lot of the "monitoring" type commands etc... in short, I think I'm doing okay with ...
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2answers
2k views

How do I reinstall software properly in Debian?

I got myself into trouble with mysql on debian lenny (details). I tried these commands: dpkg-reconfigure mysql dpkg --purge mysql-server apt-get install mysql-server mysql_install_db and variants ...
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2answers
273 views

How come I suddenly don't have any audio?

Just a few minutes ago my sound was working, and then it stopped! I suspect it was caused by me checking out some video editors. How do I go about troubleshooting this? What I've so far tried: I ...