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
57 views

Can /home/user/music and other media folders be moved to a separate drive? [duplicate]

I have two hard drives. One is a 256GB SSD and the other is a 1TB HDD. I installed Ubuntu to the SSD and that is where my /home directory resides. I would like to use the HDD for media storage. How ...
0
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0answers
27 views

Making Ubuntu Touch wriable

I am running Ubuntu Touch on my Nexus 4. By default the Filesystem is readonlya and I would like to make it writable . In this Link [1] it is promised to use this command,via a USB connection by using ...
0
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1answer
21 views

Resized Primary Partition, Filesystem Size Not Updating

I moved and resized by /boot primary partition using gparted. sudo parted /dev/sda print Number Start End Size Type File system Flags 1 1049kB 256MB 255MB primary ext2 ...
0
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0answers
89 views

initramfs unable to find a live medium containing a live file system

When I turn on my laptop I am getting the following message: BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Unable to find ...
1
vote
1answer
50 views

Allowing an OS to use unclaimed free disk space on other partitions for temporary purposes?

Let's say you have something like the following situation: three partitions, one small with OS, and several bigger ones, let's assume all are ext4: / - 10 GB size, 9 GB used, 1 GB free /...
1
vote
1answer
355 views

How do I give myself access to /var/www to create and edit files and folders in it without 'sudo'?

I have a folder in my web server /var/www. I need to add files to the folder, but the system will not let me unless I use sudo. Is it possible to give myself access to modify the folder and its ...
3
votes
1answer
74 views

Is it possible to change the filesystem type of the Compact Disc (CD) in linux using terminal commands?

I have a new Compact Disc (CD) which is sony(rewritable) and its Filesystem type is UDF. Now it is possible to change it to CDFS filesystem using terminal commands or any other software? The reason ...
6
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2answers
2k views

Why there are 2 directories having same content?

cd /proc/$$/root/bin cd /bin After running ls command on both the directory, I found that content of both directories are same (which is nothing but list of commands). Is there any specific reason ...
2
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0answers
37 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 twice?...
1
vote
1answer
45 views

When copying files via USB from Ubuntu to Windows 7, there is a different number of files

What's up guys, I'm trying to backup some Ubuntu files to my Windows machine. I have all the files in one folder and when I click "Properties" in Ubuntu it says 696 items, 742.6 MB. When I copied that ...
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0answers
8 views

Writemode journalling mode

From what I understand in data mode both inode and file data are stored in journal and in ordered mode only inode data is kept in jounral and removed after file data is successfully written. What I ...
8
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2answers
2k views

I have a file named “-t”. How to remove it? [duplicate]

Output of "ls -l": -rw-r--r-- 1 root root 0 Mar 4 08:22 -t When i try to do "rm '-t'": rm: invalid option -- 't' Try 'rm ./-t' to remove the file '-t'. Try 'rm --help' for more information.
7
votes
2answers
23k views

Which is better for a home media server: zfs or btrfs or LVM/md? [closed]

I'm looking at building a new home server and would like a flexible filesystem. Both btrfs and zfs are interesting. I want to be able to do soft raid and have flexible solution allowing me to expand ...
8
votes
1answer
400 views

How does ctime change?

I'm trying to precisely understand when the ctime timestamp of a file is changed. In many places (e.g., in the accepted answer here) it is suggested that any change in the file attributes will also ...
2
votes
2answers
4k views

Can't mount ISO file as loop device: Error: “failed to setup loop device”

sudo mkdir -p /media/cdrom cd ~ sudo mount -o loop ubuntu-* / mount: ubuntu-*: failed to setup loop device: No such file or directory
4
votes
2answers
109 views

Accidentally installed ubuntu on the whole disk instead of a specific partition

I had Linux installed on my laptop with 3 partitions: [System: 100Gb Ext4 Mount Point / ] [Data: 400Gb Ext4 Mount Point /media/Data] [Swap: 8Gb Swap] I needed to reinstall my system and wanted to ...
0
votes
1answer
62 views

In which system file does 'export' command make changes?

I installed java-8 using a PPA. After that I gave a command: export JAVA_HOME=/usr/lib/jvm/java-8-oracle I had heard somewhere that this command does temporary changes. But after many logouts and ...
0
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2answers
14 views

troubleshooting updatedb

I am taking a course that makes me go on terminal and run updatedb. but this is what I get: nonrootuser$ updatedb updatedb: can not open a temporary file for `/var/lib/mlocate/mlocate.db' so far I ...
0
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0answers
30 views

How to get to the right directory?

In sitting with Ubuntu mate 15.10 xx@ThinkPad-X250:~$ cd Desktop bash: cd: Desktop: No such file or directory xx@ThinkPad-X250:~$ cd downloads bash: cd: downloads: No such file or directory How ...
1
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0answers
29 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
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0answers
39 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 read-...
105
votes
2answers
84k views

Mount unknown filesystem exfat

When trying to mount an exfat filesystem, I get the following error: Error mounting /dev/sda6 at /media/gkp/Backup: Command-line `mount -t "exfat" -o "uhelper=udisks2,nodev,nosuid" "/dev/sda6" "/...
1
vote
1answer
142 views

What's the “/sys” directory for?

A while ago I noticed this directory that I had not ever seen before, /sys. I researched a bit and read that "modern Linux systems" often have this directory, and that it manages devices. I thought ...
0
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0answers
13 views

What should be compared with ullimit -n

I know that max number of opened files per user is set in $ ulimit -n What is the right way to get a number to compare it with? My guess would be $ lsof | grep "REG" | wc -l but this number ...
15
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4answers
5k views

What file system do I have installed?

Is there any way to check it from command line?
1
vote
1answer
2k views

How come you can put a question mark in file names?

In Windows, you can't put a ? in a file or directory name, because they are reserved characters for PHP GET functions and wildcards. But in Ubuntu, I can. I can name a file lol?.txt and access it ...
2
votes
2answers
5k views

Problem with NIS configuration

I tried to configure NIS in a server and a client both running Ubuntu 14.04 following this guide and this official guide. After a reboot the client machine got locked with this message several times ...
37
votes
3answers
29k views

How to open Nautilus at current command line directory?

I was wondering if anybody knew a command that would allow me to open a Nautilus (if that's the right name for the Ubuntu 12.04 graphic/window explorer) window from the command line at the current ...
2
votes
2answers
2k views

'cat': can't open file: Permission denied

I am trying to copy the whole / directory to some other location. When doing cp recursively, it fails on some files like:- / # ls -lrt /sys/module/nf_conntrack_ipv4/uevent --w------- 1 root ...
1
vote
0answers
95 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 ...
0
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0answers
69 views

Unable to mount root filesystem after cloning volume with dd

I am trying to clone a Ubuntu install on an 8GB SD card. I created an image of the volume using dd, then copied this image onto another SD card using dd again. The SD card contains 2 partitions: a ...
0
votes
1answer
187 views

How do I expand my filesystem? I have Ubuntu MATE on a Raspberry Pi 2

I have Ubuntu MATE on my 32gb micro SD card using a Raspberry Pi 2. I really need to know how to expand my file system. I looked it up, but all I got was an error (value out of range). I will list ...
5
votes
4answers
7k views

2015: Is BTRFS stable?

I know, questions like this have been asked before, but I'd like to get some up to date experiences.. From what I've read in various discussions, BTRFS seems like it's relatively stable, but once in a ...
0
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0answers
22 views

init.d location

I was looking through "man hier" but did not find the location of the folder init.d. The issue is that, it suddenly appeared in my home directory and has a little lock as if I am not able to access it....
2
votes
1answer
25 views

I have software (blender 2.76b) running as an “executable” from my home/documents folder. Should I move it to opt? ( (k)ubuntu 14.04)

I'm running (k)ubuntu 14.04 and everything I've read tells me to install 3rd party software in opt. everything is working fine but I want to know if I'm going to encounter problems later with add-ons ...
0
votes
1answer
22 views

How to run an application on a disk partition ubuntu

I have loaded /dev/pmem0 filesystem on /mnt/ramdisk. output of df command: Filesystem 1K-blocks Used Available Use% Mounted on /dev/pmem0 307200 4120 303080 2% /mnt/...
17
votes
3answers
14k views

Can and should UDF be used as a hard drive format?

Several time recently I've seen UDF suggested as the solution to a cross platform format for a drive used on Linux, Mac OS X and Windows XP and above. I've searched here and not found the same ...
45
votes
9answers
273k views

How to fix “sudo: unable to open … Read-only file system”?

The title might not be as descriptive as I would like it to be but couldn't come up with a better one. My server's file system went into Read-only. And I don't understand why it does so and how to ...
0
votes
1answer
78 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 ...
9
votes
4answers
2k views

NTFS -> EXT4 migration, where did 120 GB go?

wim@wim-ubuntu:~/Desktop$ mount | grep media /dev/sdc1 on /media/data type ext4 (rw,nosuid,nodev,uhelper=udisks) /dev/sdb1 on /media/wd type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,...
4
votes
2answers
2k views

Is there a way to make Thunar display “recursive” file size?

I'm using Thunar 1.6.3 and currently when I'm looking at a bunch of folders it looks something like this: Folder 1 8,2 kB Folder 2 4,1 kB Folder 3 4,1 kB Folder 4 0 kB ...
0
votes
1answer
90 views

Symlink does not work for dropbox

I am backing up home folder by create a symlink in dropbox. What I did: cd ~/Dropbox mkdir backup && cd backup ln -s ~ What I checked: ln -l. The symlink is created. The dropbox folder ...
3
votes
2answers
59k views

Recover from a corrupted filesystem when fsck do not help

Something went wrong with my filesystem, Ubuntu set it to read-only and now under Ubuntu Live Disc, fsck can't fix it. I'm running 13.04 and it won't boot - at startup, it just shows the grub rescue ...
0
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0answers
14 views

Is there any downside to using hardlinks over copying?

Let's say I have a large file (over 1 GB) I want to copy to another place on my partition. Is there a downside to just creating a hardlink (ln /path/to/large/file /path/to/target) instead of using cp?...
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0answers
27 views

Giving r-x permissions to directories of other users

I have an Ubuntu 14.04.1 server with the such permissions scheme (given below in user:group format): root: root super: sudo master master1: master master2: master user1: simple1 user2: simple2 ... ...
0
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0answers
21 views

How file advisory locks in Unix system prevent unlrelated process from corrupting data?

I'm reading about Linux OS system (which is the kernel for Ubuntu) and reached the notion of advisory locks. According to Wikipedia, a programmer can use these locks if he wishes to do so, but he ...
0
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0answers
69 views

“sudo btrfs filesystem defragment -r /” can't defrag immutabe files, right?

Files made immutable by sudo chattr +i can't be defragmented by "sudo btrfs filesystem defragment". I get the message: "ERROR: defrag failed on /path/filename: Success total 1 failure" Is this a bug ...
0
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0answers
14 views

Bad practice to keep many subdirectories in single directory [duplicate]

I was wondering if it is bad practice (or performance, etc.) to keep many (10k+) sub-directories in a single directory. Is it better or the same to group those sub-directories into more sub-...
0
votes
1answer
83 views

Unable to access “136 GB Volume”

This error message is shown every time I try to access the flash drive. Error mounting /dev/sdc1 at /media/hp/868E-F233: Command-line`mount -t "exfat" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=...
0
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1answer
129 views

How do I link the OpenAL library to eclipse in Ubuntu?

I just downloaded the OpenAL library using the command sudo apt-get install libopenal1 libopenal-dev, now I can't find where the library is on my system and how should it be linked with Eclipse. I am ...