Troubleshooting is a form of problem solving, often applied to repair failed products or processes.
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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 ...
3
votes
1answer
97 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
1answer
28 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
42 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
69 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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62 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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3
votes
1answer
171 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
272 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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64 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
92 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
54 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
votes
1answer
222 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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votes
2answers
906 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
731 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 ...
9
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5answers
1k views
Laptop running ~30° hotter than normal; CPU/Load is reportedly normal. What could cause this and how can I diagnose it?
I'm running the latest Arch Linux on my ThinkPad t420 laptop, and am having an intermittent heat problem where my temp will rise from the typical ~45°C to ~75-90°C, and stay there until I reboot.
...
2
votes
1answer
81 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
148 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 ...
4
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2answers
429 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 ...
6
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4answers
10k 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 ...
0
votes
1answer
181 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
81 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
402 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 ...
3
votes
2answers
2k 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
207 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
130 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
votes
1answer
129 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 ...
1
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1answer
235 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) ...
2
votes
1answer
55 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 ...
2
votes
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
170 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 ...
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1answer
284 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
5k 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
615 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% ...
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votes
3answers
1k 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
381 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
votes
1answer
1k 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
113 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
votes
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
votes
1answer
97 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
votes
1answer
215 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
votes
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
votes
2answers
670 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
votes
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
383 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
459 views
good unix troubleshooting book [on hold]
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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vote
2answers
269 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 ...
5
votes
1answer
837 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 ...
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3answers
539 views
Best practise to diagnose problems [closed]
As Linux/Unix users, we run into problems frequently. And after long hours of problem solving, we develop the skill of debugging.
Now, what are good principles, methods or best practises when trying ...
