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

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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 ...
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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 ...
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1answer
90 views

Error while installing ubuntu 14.04 alongside windows10 using wubi

I am using windows10 in my system. I tried to install Ubuntu 14.04 alongside windows 10 using wubi. It shows the following error. If I click "ok", then it shows the same error again.
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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 ...
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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 ...
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1answer
93 views

Unable to mount secondary BTRFS filesystem to specific subvolume

So I'm trying to wrap my head around BTRFS and set up my fileserver using BTRFS filesystems. Here is my setup: /dev/sda1 : BTRFS filesystem, contains @, @home subvolumes mounted to / and /home. ...
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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 ...
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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 | ...
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1answer
63 views

How can I restore system files that were accidentally deleted in /usr/share and /var/lib/dpkg?

So ya, earlier today I accidentally ran a rm -rf /usr/share and let it run for about 15 seconds. And then in trying to fix the error I went ahead and uninstalled all of my desktops and a bunch of ...
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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 ...
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1answer
41 views

How can two files on a CD-ROM have the same inode number yet have a link count of 1?

As I was doing some sorting of my collection of CDs, I found out that processing the output of a find with sort -u was giving me a smaller list than plain sort, so I investigated. Using diff on the ...
2
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1answer
78 views

Supported filesystems for Ubuntu touch

So I've got the new BQ Aquaris E4.5 with Ubuntu OS, and put in my SD card which is formatted on NTFS. It's not surprising that my phone does not recognize anything on the card, and i think Ext4 ...
2
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1answer
56 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 ...
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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
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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, ...
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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
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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 ...
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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 ...
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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 ...
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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
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1answer
58 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 ...
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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 ...
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1answer
73 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 ...
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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? ...
2
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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 ...
3
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2answers
101 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 ...
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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.
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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 ...
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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, ...
12
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1answer
429 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 ...
0
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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 ...
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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 ...
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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 ...
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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 - ...
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203 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 ...
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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 ...
1
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2answers
55 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 ...
2
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2answers
75 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 ...
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0answers
111 views

Ubuntu: Unable to mount SD card

I did go through other similar questions and realized that although the questions are the same but for the different reasons. Nothing so far I have tried based on online-help or suggestion helped me. ...
2
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0answers
55 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
1answer
26 views

Number of files shown via Properties and when copying are different?

I have looked at "Properties" of a folder to see the number of files and the folder's size. When I decided to copy the folder to my Desktop, number of files and the folder's size shown on the progress ...
0
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1answer
31 views

Dynamically set user groups for directories and files on a directory

I have made some vhosts which resides on my home folder, and i have given the group access to www-data user. This way the project (a web system) renders on the browser. This is a symfony based ...
22
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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.
2
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1answer
18 views

Get back Documents folder? [duplicate]

I deleted my documents and downloads folder. How can I get them back. I don't want them to be like any other folder, I would like it to be like how it used to be where it shows on the side of the ...
0
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1answer
45 views

I want to resize my mount point partition of ubuntu 12.04 and install winndows 7 .HOw can I do that? [duplicate]

I want to resize the Ubuntu 12.04 partition and install Windows 7. How can I do that? Please refer to the screenshot of Gparted editor. I want to resize the dev/sda3 partition.
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27 views

Ubuntu hard reboot. Failed to power

I was told to do a hard reboot on my ubuntu 14.04.2 Ubuntu Desktop. Once i did it didn't turn completely back on. So i got prepared to run fsck, So i put in the recovery disk and rebooted my computer ...
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1answer
22 views

In a dual boot, why can I see and mount the Windows partition, labeled 'OS'? [duplicate]

Does it present a security threat in any form?
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80 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 ...
0
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1answer
80 views

Manual Partitioning During Installation: Understanding File System Types

I am wondering if anyone can help me understand the difference(s) between the different file system types: ie. swap, ext4, reiserfs, etc... I am working with the manual partitioning during ...
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62 views

How to repair NTFS Filesystem

how can I restore NTFS filesystem...i had a partition on a 1 TB hard drive now on fdisk -l I receive 2 unknown systems one with id 72 and one with id 6c. I tried chkdsk in windows without success. ...