Questions dealing with Ubuntu's layout of files, permissions, and files that reside in special locations on disk.

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3
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0answers
68 views

How can I prune my BTRFS backups?

I have a BTRFS backup system where I take daily snapshots (btrfs subvolume snapshot) and serialize them into incremental change files based off the previous days backup (btrfs send -f backup.date ...
3
votes
0answers
113 views

Does enabling ACLs have an effect on performance?

I'm looking at a web application that needs ACLs enabled. Are there any benchmarks or other documents to show what potential impact ACL does{n't} have when the file system is under heavy load? Also, ...
3
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0answers
334 views

mystery of missing file modifications (hybrid drive + Ubuntu 12.04)

Last week (Sep 10) I worked a whole day (on my Ubuntu 12.04 HP elitebook 8530p laptop) using a tex editor (TexWorks) and Jabref to maintain a Bibtex library. Today however I noticed all my ...
2
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0answers
221 views

orphaned inodes on root file system (ext4); persistent problem

On my trusty systems (VMs under vmWare, desktops, and laptops), we have the following issue. The root file system seems to have inodes that are never marked as "free". After a month of a working ...
2
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0answers
153 views

Too many FATs on USB Drive?

A while ago, I wrote an image on a USB drive using something along these lines: dd bs=4M if=/path/to/image.iso of=/dev/sdb && sync Something must have gone terribly wrong there because ...
2
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0answers
141 views

Difference between FUSE and VFS in linux?

What is the difference between VFS [Virtual File System] and FUSE [File System in User Space] in linux. I think, most of the popular OS today support VFS feature. I recently had a chance to go through ...
2
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0answers
280 views

Why aren't my changes to /etc/security/limits.conf having effect?

I am trying to provide support for core dumps on my Ubuntu machine (as by default they are disabled). So I have made the following changes to /etc/security/limits.conf: root hard core 1000 After ...
2
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0answers
303 views

A Linux container can use an authorized_keys file outside my home directory, but ephemeral containers based on it can't. Why?

In Ubuntu 12.10, I've created an LXC of type 'ubuntu' using the lxc-create utility. I then create ephemeral containers based on this container using the lxc-start-ephemeral utility, and I need to ...
2
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0answers
361 views

No filesystem could mount root

I am trying to boot a linux kernel 3.7.0 on virtualbox and it keeps telling me the same message: "No filesystem could mount root tried ext3 ext4 vfat fusebk". I put append root=/dev/sda in my isolinux ...
2
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0answers
223 views

What is an appropriate way to install Lustre on a ubuntu 12.10 cluster

I have a 24-nodes cluster installed with Ubuntu 12.10. What is the suggested way to install a relatively new Lustre version on such a cluster?
2
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0answers
320 views

Auto-mount filesystems on boot fails (12.10)

I have a Compaq HP 8200 slim desktop running 12.10 with encrypted partitions (set up with the text-based installer). Everything's working fine, except... When I boot the computer, my /boot and ...
2
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0answers
669 views

Ubuntu 12.04 - syslog showing “SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled”

I have been seeing these random logs in syslog on our production system. There is no XFS setup. Fstab only shows local partitions, only EXT3 . There is nothing in crontabs either. The only file ...
2
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0answers
828 views

Google Chrome causing file system to mount as read only

So disclaimer, I am using Lubuntu 12.04 but I'm almost certain it shouldn't make any difference. Earlier this week I resized my lubuntu partition on my harddrive with GParted to be 25 GBs smaller, ...
2
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0answers
310 views

Why don't I have permission to read files on the CD I bought?

I recently bought this book, which came with an accompanying CD. When I try to view the contents of the CD in Ubuntu, I don't have read permission for any of the files. ls -al in the root of the CD ...
2
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0answers
1k views

Setting up group disk quotas

I am hoping to get some advice in setting up disk quotas. So, I know about: Adding usrquota and grpquota on to /etc/fstab for the file systems that need to be managed. Using edquota to assign disk ...
2
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0answers
398 views

Mounting encrypted file system on Windows

Is there a way to mount (read/write) an encrypted file system on Windows? By "encrypted" I mean whatever it is that Ubuntu does to encrypt a file system when you choose that option during formatting. ...
2
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0answers
265 views

Why Is 32-bit Ubuntu Folder Size Much Larger Than 64-bit Version?

I noticed this when sync'ing a folder with hundreds of thousands of sub folders from my local 32-bit Ubuntu (10.04, ext3) to my remote 64-bit (10.04 ext3) VPS. The size of the local directory is ...
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0answers
39 views

Lost+found folder still present even after reformatting partition - how to remove?

I'm trying to reorganize the partitions on the 2 HDDs that I have on my system. One of the partitions (ext4) is 883 GiB (according to gparted) and apparently has 14 GiBs used. However, if I mount ...
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0answers
81 views

An error occurred while mounting /

for no reason I have not been able to boot Ubuntu 14.04 today. Splash screen at first displayed "An error occurred while mounting /". I tried to do filesystem check: ubuntu@ubuntu:~$ sudo fsck.ext4 ...
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0answers
23 views

I have lags when I'm deleting files from desktop with Xubuntu

I have Xubuntu 14.04 and I am experiencing some lags when I work with desktop icons, especially when I'm deleting them. Haven't notice that with Thunar filemanager and in System Monitor couldn't ...
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0answers
68 views

Why MTP mounted files belong to root?

Xubuntu Saucy and an Android device running Kitkat. I connect it to my computer and it is mounted as MTP but the files on it belong to root so I can't modify them. Why is this and how can I change it? ...
1
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0answers
25 views

Is ext4 position independent and movable?

Does the data in an ext4 filesystem refer to absolute positions on the disk, or is it all relative to the start of the specific partition? I want to know this because I want to move an ext4 ...
1
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0answers
135 views

Slow network and file copy performance

I'm experiencing a weird problem with my Kubuntu installation. I'm running 14.4 now that was upgraded at least twice using the built-in distribution upgrade. The problems started after the last ...
1
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0answers
26 views

Reason of removing apt/dpkg/lock & apt/archives/lock

Is it possible to install multiple packages by deleting " Using apt & dpkg in the same time ". dpkg/lock & /archives/lock The Ubuntu Developers made it for reason "that you can not ...
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88 views

Accidentaly formatted boot partition

I accidentally formatted the partition that contained the GRUB loader, so I cannot boot into Ubuntu 14.04 LTS. Background to the saga: I have an iMac with OSX and Ubuntu 14.04 LTS installed side by ...
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0answers
344 views

Strange output of btrfs fi df after converting from RAID0 to RAID1

I just converted my 3 disk btrfs filesystem from RAID0 to RAID1 and balanced it. At first the data was all in the RAID0 filesystem, so running btrfs filesystem df showed something like this: (XX are ...
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0answers
23 views

KVM image size has changed?

We had a 180GB VM image. Inside the guest VM everything is OK and hdd size is 180G. but when we look the image size on the host it is 475MB. I am afraid that if we restart, the VM wouldn't work. I ...
1
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0answers
22 views

Detect file size decrease

I am saving streams from browser cache into my home folder. I wrote a script that takes the specific data type and saves them into disk, and names them as data.1, data.2 , data.3 and so on, creating ...
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0answers
29 views

Ubuntu File Appearing As Directory

I have this php file that somehow is showing as a directory. It still has a php extension but when I cd the file I get: base: cd: satisfaction.php: Input/output error When I vim the file it looks ...
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0answers
80 views

Disable filesystem read cache

How can I disable the Linux filesystem read cache for Ubuntu 12.04? I do not want to only free the actual cache ( echo 3 > /proc/sys/vm/drop_caches ) but disable the read cache completly.
1
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0answers
3k views

Ubuntu 13.10 to 14.04 upgrade: Filesystem check or mount failed

I had a power failure while upgrading from 13.10 to 14.04 and and ended up with a couple of problems. First I ended up the "system is running in low-graphics mode" error described here and managed to ...
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0answers
86 views

Trying to move usr and home to usb drive

I'm running Ubuntu through crouton on a Chromebook 14 and since the system only has 18GB of space I want to put /home and /usr on a 32GB flash drive that I will have attached to the system. I have ...
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0answers
63 views

How to change the default block allocation policy of a file system?

Every file system has some default block allocation policy. For instance unix file system scatters the blocks of a file randomly on disk while ext2,ext3 allocates blocks of a file in block groups. Is ...
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0answers
19 views

files are hiding automatically in between Ubuntu 12.04 and windows 8

I have installed both windows 8 and Ubuntu 12.04, in separate drives. i am using 2 other drives commonly between 2 OS to store the data. if i copy or use those files with Ubuntu,later if i tried to ...
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0answers
246 views

Ubuntu 12.04 ext4-fs error/inode

I am running a Dell PowerEdge T420 with Ubuntu 12.04 32bit. The hard drives are a RAID1 setup. Last week, I began getting errors that cause the build I am running to fail. I found this in the log ...
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0answers
99 views

Resizing Xubuntu patrition

Ok, here is the problem. I have a Xubuntu in Virtual box. I have resized the machine HD and added the missing space using GParted to the patrition as seen in this picture: After resize the new size ...
1
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0answers
56 views

Files not readable on Windows

I have a video server running Ubuntu 12.04.3 LTS, which works fine for what I need it to do. Although, as it is a video server from which I stream movies to my Windows machine, that's what I expect ...
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0answers
31 views

Monitor all changes a program made during the installation

Ubuntu 12.04 64 I would like to monitor all changes a program make to my system during the installation and first startup. Is there any solution how i can monitor this? I checked out "iwatch" and ...
1
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0answers
92 views

Mounting 2nd Hard Drive (Win7)

I have Ubuntu 13.10 installed on my internal hard drive and I’m tiring to mount a 2nd internal to recover data off it. It has Win7 Home installed on it. I am having problems mounting it. What is the ...
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0answers
368 views

How to store LXC container's files in another folder

Well the answer seems to be given on https://help.ubuntu.com/13.04/serverguide/lxc.html#lxc-hostsetup page under Using a separate filesystem for the container store title but it doesn't work for me. ...
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0answers
36 views

Ubuntu: Files Deleted Abruptly. HDD Space is still Full. Ubuntu 13.04

Somedays ago I was trying to open some file. It shown some error like 'Can't Read the File'. I ignored this completely. Then Today to see what has happened I restarted my system. To my astonishment ...
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0answers
243 views

Recover an overwritten file

My project c source code file became corrupted while making the tgz of the file. I wanted to make *.tgz of 4 files. The file names are common.c, common.h, myfile.c and myfile.h. I mistyped the tar ...
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0answers
34 views

Can't boot anymore, get a message on ubuntu purple screen

A friend has a Compaq laptop with a broken screen, so he use an external screen with HDMI and use Ubuntu 12.04 LTS. But after a while after he started the computer, the screen finally show up with ...
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0answers
215 views

Permission denied creating file on Ubuntu Server (Amazon EC2 instance)

sudo has been working fine for installing applications and running scripts, but when I try and create a file I am getting a "Permission Denied". I have tried: sudo cat > file.conf and sudo echo ...
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0answers
243 views

How do I get rid of a corrupted filename ( / inside ) in ext4 home mount point?

/home sudo ls -l rubish ls: can't access rubish/tongue/gif: none file of folder of that kind total 0 -????????? ? ? ? ? ? tongue/gif I could move the folder to the top of /home but I ...
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0answers
90 views

“Different filesystems on the same disk” issue on Community Ubuntu Documentation guide

Reading the Partitioning/Home/Moving guide (about to move my /home to a different partition), I came across this notice: If you're moving from Windows and your new home partition is going to be an ...
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0answers
149 views

Is it possible to extend filesystem using network drive?

I'm running very low free disk space on my file system. Is it possible to extend file system size using network drive (using LVM or similar) Preferably I would like to use Google drive (There is ...
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vote
0answers
2k views

Errors during start-up: “Scanning for Btrfs filesystems”

I have installed Ubuntu 12.10 desktop on three systems and one virtual machine. On every system I have opted for a single Btrfs partition. During start-up I get the following two error messages. It ...
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0answers
176 views

file acess slow after deletion of many files

I recently accidentally created millions of files in one folder (rougly 5 million) and due to limitations I couldn't process them correctly (maximum argument count exceeded for wc / ls and such ...
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0answers
634 views

NTFS partition not clearly unmounted PLEASE HELP

When ubuntu boots, I get this error: The NTFS partition was not cleanly unmounted. This probably indicates that the system was not shut down properly. Please run chkdsk /r from Windows; once ...