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

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6
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0answers
415 views

Disable filesystem read cache

How can I disable the Linux file system read cache for Ubuntu 12.04? I don't want to only free the actual cache. echo 3 > /proc/sys/vm/drop_caches but disable the read cache completely.
4
votes
0answers
752 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 ...
4
votes
0answers
545 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 ...
3
votes
0answers
30 views

Fastest File System Type

We currently/still write to tape for off-site backups (avg size is 80 GB per day) and the robot is misbehaving as of late. I'm setting up an NFS share on Ubuntu Server 14 (16 when it releases) to ...
3
votes
0answers
293 views

Ubuntu 15.04 checking an ext4 partition on every boot

I have gone through other posts similar to my question, but i tried all solutions/ or their methods dont apply to my case. there is no /forcefsck file on my system. fstab contents: ...
3
votes
0answers
336 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 ...
3
votes
0answers
132 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
votes
0answers
373 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
votes
0answers
30 views

What is the partition type ('t' command) in fdisk good for?

I can't understand the difference between the filesystem specified using fdisk's command line interface with t. And the one used to format it later using say mkefs. Why do we need to specify it ...
2
votes
0answers
200 views

Ubuntu 15.10 cannot unmount file system on shutdown

My Asus Ux303 laptop cannot shutdown, because it hangs at unmounting the filesystem. It hangs at Unmounting local filesystem... Any ideas what could cause this or how to diagnose it?
2
votes
0answers
31 views

Gedit not preserving extended attributes on file edit

I'm working on a project where i rely mostly on the file's extended attribute that i set when i create the file. But i'm facing problem while modifying the file. Example: When i edit a text file in ...
2
votes
0answers
188 views

error:unknown filesystem. Entering rescue mode… grub rescue

Here's what's happening: I think my laptop ran out of power and shut itself off (while the lid was closed). When I started it back up I get: error:unknown filesystem. Entering rescue mode... grub ...
2
votes
0answers
104 views

What's up with the sudden appearance of .AppleDouble folders all over my filesystem?

Something I have never seen on my Ubuntu machine before now- .AppleDouble folders have appeared in many different folders all over my filesystem. It creeped me out- like someone on a Mac was looking ...
2
votes
0answers
84 views

The / and /usr merge not implemented in my Ubuntu?

Reading through systemd docs I came across TheCaseForTheUsrMerge. The discussion about this topic dates from around 2012 AFAIK, and the opinion then was that all major distribution would incorporate ...
2
votes
0answers
682 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
votes
0answers
276 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
votes
0answers
516 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
votes
0answers
340 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
votes
0answers
354 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
votes
0answers
1k 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
votes
0answers
1k 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
votes
0answers
347 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
votes
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
votes
0answers
709 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
votes
0answers
997 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 ...
2
votes
0answers
281 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 ...
1
vote
0answers
27 views

After crash I get an unknown filesystem error

Today my PC crashed (I was kinda expecting it cos Firefox and full screen videos kinda crash my PC) and when I rebooted I got an error saying unknown filesystem. I booted to a live USB and the ssd ...
1
vote
0answers
31 views

USB read-only via graphic UI and writable via CLI

Why I'm unable to write on USB via Files (Nautilus, graphic UI) and I'm able to write on it using CLI? Using Files I'm getting the error: Error while copying to "DEVICENAME". This destination is ...
1
vote
0answers
29 views

Need help extracting data from a floppy disk formatted by an old drum machine

Alright, for context I make music using an old drum machine which uses 3.5" floppy disks (Emu SP-1200) and I am trying to take a look at what the OS binary and sound file formats are like. But I'm ...
1
vote
0answers
19 views

Ubuntu 15.10 doesn't seem to support sparse files

On Ubuntu 15.10 using ext4 when I perform truncate -s 512M test.img du -h test.img the output is 513M test.img however if I run du -h --apparent-size test.img the output is 512M ...
1
vote
0answers
25 views

Directory converted to a file

I have an external HD formatted to ext4. Somehow a directory is now showing up as a file (i.e. it is missing the 'd' in the attributes). fsck does not show any errors. I don't believe that the ...
1
vote
0answers
59 views

Find a file activity

I need to find what are all files opened yesterday in my system.I didn't installed GNOME activity. Is there any way i can see the activity a file when are all a file opened and how many times ...
1
vote
0answers
99 views

Change filesystem blocksize when installing 15.10

so, I'm very much out of my depth in the whole world of *nix here. I'm searching all over about file system block sizes, and I found this script which determines what I can tell are read-speeds with ...
1
vote
0answers
44 views

How to tell filesystem type of digital camera

I have a Fuji X-M1 digital camera and I need to find out what filesystem type is, I have attached it via USB to my Ubuntu GNOME 15.04 machine, but upon right-clicking on it in Nautilus I do not get ...
1
vote
0answers
33 views

How is it possible storage hard disk failure cause system disk to fail to read/write?

Update: One of the 3TB Seagate Storage Drives was dying and any time I had it connected to the system, I got the IO/read errors, eventually even when the system was booting. As described below, ...
1
vote
0answers
246 views

How to troubleshoot cause of read-only file system errors

I'm running Xubuntu off of a fairly new Samsung EVO 250GB SSD. Recently my root file system has been going into read-only mode and I need help troubleshooting it. These are all the errors (and many ...
1
vote
0answers
31 views

Move files preserving symbolic links

I have some files on an external hard drive, to which I keep soft symlinks in my home folder (many links, not just one). I need to move some of the original files to another hard drive, and I want to ...
1
vote
0answers
15 views

How does an encrypted file system stay reasonably fast?

I want to encrypt my file system and wondered can my file system stay as fast as it would be without any encryption? If so why, if not how does this affect the read/write operations?
1
vote
0answers
27 views

fast/easy file system snapshot

I am working in a lot of team projects and usually team members come to my computer in an attempt to help and they ruin my workspace. My workspace for a project spans folders in different locations. ...
1
vote
0answers
23 views

VirtualMode to remove MSDOS filesystem files in Ubuntu?

I have a MSDOS memory card where I would like delete files by my Ubuntu installation. I run on those files sudo rm /media/masi/g0399/DCIM/video.mp4 but I get a filesystem error that the filesystem is ...
1
vote
0answers
17 views

How to properly move /home from separate partition into / partition?

I have two logical volume which one is used for / and another one for /home. The thing is now I want to have /home to be not separated from the /. I want to use the logical volume which I use for / to ...
1
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0answers
262 views

root file system mounts as read only after some time

My root (/) file system get remounted as read only after the system has been up for some time. This seems to vary from 3 hours to 48 hours. This system is running Ubuntu desktop 14.04. Its primary ...
1
vote
0answers
89 views

Android phone's microSD not useable by Windows 8, after using under Ubuntu

I connected my Android phone (as 'mass storage') to Ubuntu 14.04 LTS. It has a microSD card with fat32 filesystem. Thereafter I logged it to Windows and connected, but my Windows 8 didn't recognise ...
1
vote
0answers
249 views

read only file system after upgrade to 15.04 with

The problem is occurring when loading ubuntu with systemd. If I'm manually starting with upstart (from boot menu) then everything works fine. I've checked the disk with badsector and I have no ...
1
vote
0answers
161 views

How can I repair my LUKS / ext4 file system?

my computer was running the whole night and my only open windows where IntelliJ IDEA and Google Chrome. Today my file system seems completely corrupted. Linux Mint can't read any files and folders ...
1
vote
0answers
42 views

add/delete ubuntu specific folder or file right click context using bash

I want to change the right click context menu of ubuntu specific folder using bash script. When bash script executes, it first create a file or folder having only two right click context menu option. ...
1
vote
0answers
171 views

sh file installation (CMake package)

newbie's question : I need to install latest cmake on my ubuntu. I've downloaded .sh file allowed this to execute as a program and run. seems it was not a fully functional setup but an archive only ...
1
vote
0answers
83 views

Zenity (alike) File Browser with custom filesystem Root

I am creating ubuntu application which need to display file browser from command line, and request file selection from user. I am aware usage of zenity --file-selection --file-filter="MP3 Files | ...
1
vote
0answers
158 views

I can't access into my Ubuntu account 14.04

For disgrace I have asked advice in "chiedi Ubuntu" forum - the Italian version of ask Ubuntu - and for following their advice, I can't get anymore in my Ubuntu account due to internal errors of the ...
1
vote
0answers
408 views

How to mount UBIFS/MTD partitions?

I have a lovely mount: unknown filesystem type 'ubifs' error with Ubuntu 14.04. What package provides this functionality? It should be included in some previous versions of Ubuntu. The mtd-* ...