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

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0
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1answer
46 views

How to add directory bookmark when the parent directory is not readable?

In file dialogs and file managers, it's possible to add bookmarks representing directories, used similar to other "places". To add a bookmark for a directory, I have to enter the parent directory and ...
0
votes
0answers
21 views

How to prevent Truectypt volumes from appearing on the launcher panel?

I am using Truecrypt for some purposes (yes, I know it is considered compromised but I believe it's enough for my case and I find it very convenient) and I don't want the volumes I mount with it to ...
0
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0answers
71 views

Ext4 file system creation failed

Every time I try to install it gives me the error file system creation failed, or failed to mount. I'm trying to install Ubuntu as the sole OS. I was trying to install alongside Windows 7 but clicked ...
0
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0answers
34 views

How can I make proper use of subvolumes in btrfs?

In the past, I've always used three ext4 partitions to fulfill my needs: /dev/sda2: / /dev/sda3: /home /dev/sda4: /mnt/Data Right now, I'm using Ubuntu 15.04 with the btrfs filesystem. After ...
1
vote
0answers
44 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 | ...
0
votes
2answers
65 views

What is this Directory?

I know that the .desktop files of mostly of installed applications will be founded in the /usr/share/applications. Today and accidentally I came to the directory /usr/share/app-install/desktop. It ...
3
votes
2answers
7k views

Mounting Disk Image in Raw format

While trying to mount a disk image in Raw(dd) format using the following command mount nps-2010-emails.dd /media/manu/ I get the following error message mount: you must specify the filesystem ...
0
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0answers
35 views

/proc/fs/jbd2/partition/history - how to enable?

I have the /proc/fs/jbd2/partition/info file that produces the summary of what happened in the partition's journal so far, but I am not able to see the history file. It doesn't exist. What should I do ...
1
vote
1answer
101 views

ls discrepancy with du df output

Adding up the sizes of files and directories returned by ls gives a different value than that given by df or du. The df and du commands give me the same output, so I don't have that frequent problem, ...
2
votes
1answer
54 views

How to find the size of a filesystem?

How can I find out the size of a filesystem in Linux? By that I mean the exact number of bytes that are used from the partition, not just the output of df, as that can differ from the true size when ...
1
vote
1answer
29 views

Ubuntu Desktop shortcuts 'No longer exists'

I'm using Ubuntu 14.04 with Windows 7 dual-boot. If I try creating a shortcut of a folder from my local drive, say "E:" and send it to ubuntu desktop, the next time I log in to Ubuntu, the folder ...
1
vote
1answer
37 views

shareable vs unshareable files

I'm reviewing the Filesystem Hierarchy Standard and it states: "Shareable" files are those that can be stored on one host and used on others. "Unshareable" files are those that are not ...
1
vote
1answer
61 views

Disk allocation

I installed ubuntu 15.04 and used entire space(640 GiB) for ext4 partition but now it is showing that used space = 30.91 GiB, free space = 24.96 GiB and 536.40 GiB unallocated space. I tried to extend ...
22
votes
2answers
5k views

How to find the creation time of a file?

I need to find the creation time of a file, when I read some article about this issue, all mentioned that there is no solution like Site1, Site2. When I tried stat command it state Birth: - So how ...
0
votes
0answers
33 views

fsck took only two seconds to report “clean”. What did I do wrong?

I booted a LiveCD (Ubuntu 14.04.2) and opened a terminal window. I used sudo lshw | more to determine that my usual boot volume was logically named /dev/sda1 . It's the primary partition on a 1 ...
100
votes
3answers
53k views

What is the difference between /etc/init/ and /etc/init.d/?

What is the difference between /etc/init/ and /etc/init.d/? More generally, what meaning does the .d suffix convey to a directory?
0
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0answers
16 views

Desktop shortcuts getting corrupted in Ubuntu 14.04 LTS

If I create a desktop shortcut in Ubuntu, for my folder(s) off my local drive, and when I login the next time, the shortcut link will be EXPIRED! If I try clicking that link, I get a message that the ...
1
vote
2answers
1k views

Unable to mount cifs with iocharset=utf8 in trusty

When I try to mount a cifs share with option iocharset=utf8 I receive the error: mount error 79 = Can not access a needed shared library. What shared library am I missing?
1
vote
1answer
69 views

Re-install and keep home partition with btrfs - lost files

So, I was running Arch Linux with separate / and /home. Both were btrfs partitions, but the whole drive was not managed by btrfs. I decide to install Ubuntu 14.04. I carefully select to format / and ...
0
votes
1answer
57 views

Problem accessing old data on btrfs /home in ubuntu 14.04

I recently did a fresh installation of ubuntu 14.04 64 bit on my pc. Previously I was dual booting ubuntu 14.04 with windows(both 32 bit). My hdd is 500 GB. The previous structure of the hard disk was ...
55
votes
5answers
18k views

Why have both /mnt and /media?

It seems to me that having both /mnt and /media is a little redundant. Is there any tangible difference between the two that I'm not aware of? Is there a standard that most people follow for where to ...
8
votes
3answers
166 views

How to run a script when a directory is changed by another user?

I know has been a bit of discussion about topics similar to this. But here is what I am basically trying to do. I have a watch directory called watched and whenever a file is added to that directory, ...
0
votes
1answer
71 views

GRUB Rescue - Cannot use insmod, msdos3 does not appear and bootable CD is not working. Please help

First, I must confess that I know almost nothing about Ubuntu, GRUB, GNOME, or anything else to do with Linux. I've been using Windows for as long as I can remember, so my experience with Ubuntu spans ...
0
votes
1answer
34 views

what is the default ownership permission of /var directory? [duplicate]

I just messed up with my /var permissions , setting the chmod -R 775 and chown $USER:USER to it.. My poblem is, i want to set its default permission. Is there someone who can help me on this problem? ...
0
votes
2answers
484 views

ERROR : [cat: File does not exist] I can't open hadoop output file in 14.04

I have installed hadoop-1.0.3 in my system(14.04), followed this tutorial. And I successfully run an sample mapreduce program for wordcount as follows, hadoopuser@arul-PC:/usr/local/hadoop$ ...
8
votes
3answers
12k views

How can I convert my root partition from BTRFS to EXT4?

Is it possible to convert btrfs to ext4 without losing data? I'm experiencing a very low speed on read/write operations on btrfs.
3
votes
2answers
99 views

vmlinuz and initrd strange files appeared in “/” directory

I have recently noticed that four new files have appeared in my / directory: lrwxrwxrwx 1 root root 33 Apr 9 14:07 initrd.img -> boot/initrd.img-3.16.0-34-generic lrwxrwxrwx 1 root root ...
2
votes
1answer
42 views

How to get rid of disk icons in Unity launcher? [duplicate]

I have got here an installation of Unity and I am annoyed with the 3 disk icons in the Launcher right below the workspace switcher. Is there a way to prevent these icons from showing? Those 3 icons ...
57
votes
6answers
10k views

How is 'rm -rf /' able to delete all files in the system?

I haven't tried this command on Ubuntu (for obvious reasons) so I am not sure if Ubuntu will allow its execution. But it's famous for deleting everything. Just out of curiosity, what happens when the ...
1
vote
2answers
147 views

What harm can a cold reboot cause into your computer? [closed]

I was taking a look at the game DEFCON, and it froze my PC. Unfortunately, I only discovered the REISUB thing after a cold reboot. Now, what harm the cold reboot caused into my computer? Any type of ...
0
votes
0answers
41 views

How to allow only one program to read/write to a file at a time in Ubuntu?

Is there any way in the OS, to issue read/write lock on file? I mean, the file itself should not open, if a lock is issued! NOTE: Don't give me programming solutions.
0
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3answers
54 views

Unnoticingly I deleted a directory. Is there a way to recover it?

I found something over the internet here https://www.howtoforge.com/data_recovery_from_accidently_deleted_files_or_crashed_drives_in_ubuntu ...
14
votes
3answers
32k views

Can I disable full-disk encryption?

I recently installed Ubuntu 12.10 and it requires a passphrase to boot up (I installed it with an encrypted file system). Do I have to reinstall to change to a standard unencrypted file system?
0
votes
2answers
125 views

Use of “cp” command between root user's home and plain root

How do I use the "cp" command to copy files from root@pcname:/home/username # to root@pcname:~ # I have been able to use the mv command to move a file, but when I use cp, it tells me that the ...
29
votes
3answers
43k views

How do I use OverlayFS?

This answer and email message indicate that something called "OverlayFS" is available in Ubuntu 11.10 and will forcefully replace aufs in Ubuntu 12.04. How do I use it? Where is its documentation?
12
votes
1answer
425 views

Where are SMS and MMS stored?

I have BQ Aquaris E4.5 Ubuntu Edition phone and I'm not able to get MMS. If someone sends me a MMS, I just get empty message with no sender or anything. I can see those messages in message-app but ...
22
votes
2answers
2k views

Does the /dev/null file actually have a fixed size?

I have just found out that /dev/null is a file and not a directory. I'm just wondering if it has an actual file size.
0
votes
1answer
84 views

btrfs performance parallel access

I'm running a Raid5 (3x 500GB Sata2 HDD) based on btrfs 3.12 (Ubuntu 14.04 x64) and a VirutalBox VM uses this volume. As long as no other process accesses the volume, the VM runs fine. But recently I ...
0
votes
0answers
67 views

Linux, boot safe mode - repair broken packages not working?

Xubuntu 12.04 Application windows started to open only partly functional/broken? Some do not display fully, are not able to minimise, expand or close (missing these buttons) and are visually flat - ...
0
votes
0answers
25 views

How to hide btrfs devices in nautilus dynamicly

According to this question and answer: How to hide btrfs devices in nautilus? Is it possible to do this dynamically? Devices like /dev/sdc1 might not be the same on next boot, so a static ...
0
votes
0answers
201 views

Read only filesystem?

Whenever I try running apt-geti get this error: mike@mike-ubuntu:~$ sudo apt-get upgrade [sudo] password for mike: sudo:unable to open /var/lib/sudo/mike/1: No such file or directory W: Not using ...
12
votes
3answers
2k views

using locate on an encrypted partition

I selected /home/ to be encrypted when I was installing Ubuntu. Now, is it possible to make locate work with an encrypted partition like this?
0
votes
0answers
13 views

purpose of bamf-2.index [duplicate]

What is the purpose of /usr/share/applications/bamf-2.index ? I have noticed the applications it contains are installed in my computer. But I don't think it contains the complete list. Because the ...
2
votes
2answers
74 views

How to protect essential Windows files on NTFS partition from edit/deletion in Ubuntu?

So I made a mistake yesterday, accidentally deleting essential Windows files when working in Ubuntu (namely NTUSER.DAT). Just quickly my system set-up: I have Windows 7 (NTFS partition) and Ubuntu ...
111
votes
6answers
39k views

How to understand the Ubuntu file system layout?

In Windows there’re perhaps only a couple of important folders (by important I mean important in my logical picture of the Windows file system) in the installation drive (in my case C:\). Namely ...
3
votes
1answer
128 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 ...
0
votes
1answer
22 views

Is O_NOATIME safe to ignore?

I am designing a filesystem to be implemented in FUSE. I have a question regarding what is allowed and best practice. There are 2 scenarios: User process calls open(..., O_NOATIME). Filesystem ...
6
votes
2answers
4k views

What is the easiest way to merge / and /home?

I have separate / and /home partitions, of which both use ext4 as their filesystem. How can I merge them, and what is the easiest way?
1
vote
2answers
54 views

Folder permissions changed [duplicate]

I have very specific questions regarding permissions. I have delved into the FilePermissions Wiki - https://help.ubuntu.com/community/FilePermissions Recently I installed an ecommerce open source ...
0
votes
1answer
133 views

Irremovable folder after wiping free space with bleach bit

I have a following problem. Yesterday I was using Bleach Bit as root to wipe free space. When I woke up Bleach Bit was not Responding and the terminal hangs on "suffix length = 235". So I force Bleach ...