163
votes
2answers
318k views

How do I search for available packages from the command-line?

I have successfully installed some packages using the command line 'sudo apt-get install ...' when I have known in advance that those packages are available. But how can I search for or get a list of ...
163
votes
11answers
141k views

How can I stop being prompted to unlock the 'default' keyring on boot?

Whenever Ubuntu boots up, a dialogue pops up asking me to unlock my default keyring. Is there some way this can unlock automatically through PAM or some other magical way?
162
votes
5answers
824k views

Change folder permissions and ownership

I would like the user to have full rights on this folder (as well as all sub-directories and files in it): ~/.blabla currently owned by root. I have found numerous posts (in this forum and ...
162
votes
10answers
118k views

Trouble downloading packages list due to a “Hash sum mismatch” error

When I check for updates, I get a "Failed To Download Repository Information" error. This is what comes up under details: W: Failed to fetch ...
161
votes
7answers
437k views

Screen Resolution Problem with Ubuntu 14.04 and VirtualBox

Environment: Lenovo T530 running Windows 7. Have installed Ubuntu 14.04 on a virtual machine using VM Virtual Box. Have installed all the updates from both Virtual Box and Ubuntu. Problem: While in ...
161
votes
5answers
407k views

How can I copy the contents of a folder to another folder in a different directory using terminal?

I am trying to copy the contents of a folder to another folder in a different directory using terminal. Would somebody be able to provide me an example of the command line syntax required to achieve ...
161
votes
6answers
118k views

How can I install just security updates from the command line?

sudo apt-get upgrade installs all updates, not just security updates. I know that I can use Update Manager to select only important security updates, but is there a way to do this from the command ...
160
votes
24answers
86k views

Do I need to have 'antivirus software' installed? [closed]

I thought that there was no need to scan for viruses either in Ubuntu or any Linux distros until I found virus scanner packages 'clamtk' and 'klamav' in Ubuntu software center yesterday. This leads ...
160
votes
6answers
140k views

What is the difference between adduser and useradd?

What is the difference between the commands adduser and useradd?
156
votes
13answers
306k views

How do I change the computer name?

When I connect to my server (ubuntu server 10.10), I get this: name@server-name.belkin ~> How can I remove ".belkin"?
156
votes
6answers
140k views

How do I remap certain keys or devices?

I'm searching for a way to remap certain keys in ubuntu. i.e. I'd like to change PgUp to Home or PgDown to End. Does a built-in command or a tool exist reassign keys in Ubuntu/GNOME?
156
votes
6answers
67k views

How do I find the package that provides a file?

Simple enough question: is there some shell command (or GUI method) I can use that, given the path to a file on my system, tells me what package put it there? Assuming the file did in fact come from a ...
155
votes
5answers
151k views

How is the /tmp directory cleaned up?

How is the /tmp directory cleaned up? Is it automatic? If so, how frequently is it cleaned up?
155
votes
5answers
158k views

How do I get a list of installed files from a package?

I want to know where I can find my installed application when I installed it on Ubuntu using package manager. I installed RabbitMQ and ran locate rabbitmq which gave me following result: ...
154
votes
5answers
114k views

How do I enable or disable Apport?

The system crash dialog is annoying me, how can I turn it off? I'd also like to know how to turn it back on just in case I need it to report a problem.
153
votes
6answers
219k views

Why does a Ubuntu guest in VirtualBox run very, very slowly?

I'm using currently Ubuntu 12.04 LTS as a host machine, and I've virtualized three machines: a Xubuntu 12.04 guest a Windows 7 guest a Ubuntu 12.10 guest All the guests have the same VirtualBox ...
153
votes
12answers
145k views

How do I reset my Unity configuration?

I've been messing around with Unity and broke something, how do I "start over"?
153
votes
10answers
263k views

How do I get the CPU temperature?

How do I get the CPU temperature?
153
votes
15answers
53k views

How to customize the Ubuntu Live CD?

I would like to customize Ubuntu live CD by installing some additional packages. I have followed this but it doesn't seems to work. Can anyone provide clear instructions? Note: I do not prefer ...
151
votes
16answers
156k views

Is a NVIDIA GeForce with Optimus Technology supported by Ubuntu?

I am considering buying a Dell XPS 15 laptop. The laptop has a Nvidia 420m card which should work with Linux but I keep reading that the Nvidia Optimus technology isn't supported on Linux. I am not ...
151
votes
2answers
171k views

How to enable TRIM?

I know that the Linux kernel supports TRIM as of version 2.6.33, so there should be TRIM support in ubuntu. Is TRIM enabled by default or do I need to change some settings or install additional ...
149
votes
12answers
345k views

How do I install and use the latest version of GNOME?

I followed the instructions for compiling GNOME Shell and it did compile with a few errors here and there but it didn't run. I installed GNOME Shell using sudo apt-get install gnome-shell but I got ...
148
votes
46answers
725k views

Installing Broadcom Wireless Drivers

I'm having serious problems installing the Broadcom drivers for Ubuntu. It worked perfectly on my previous version, but now, it is impossible. What are the steps to install Broadcom wireless drivers ...
148
votes
9answers
285k views

How do I increase the hard disk size of the virtual machine?

I have run out of space on my WinXP virtual machine, which I only gave 10 GB space for when I created it. Is there an easy way to increase it to, say, 20 GB? I can't see any obvious option in ...
148
votes
12answers
73k views

Why does Ubuntu Download recommend 32-bit install? [closed]

Update for 13.10: 64-bit version is now the default and 32-bit is labelled "for machines with less than 2GB RAM" The Ubuntu desktop download screen has a pair of radio buttons you use to select ...
147
votes
10answers
104k views

How to prevent updating of a specific package?

Because of bug #693758 I'd like to prevent apt-get upgrade and Update Manager from updating the "libgtk2.0-0" package. How can this be achieved?
147
votes
31answers
223k views

Ubuntu gets stuck in a login loop

My Ubuntu is stuck in a login loop when trying to enter my desktop. When I login, the screen gets black and soon after that the login screen comes back. I've read that the problem might be caused by ...
146
votes
13answers
294k views

How can you log out via the terminal?

Is there a command, that will take you back to the login screen?
145
votes
10answers
497k views

How to use “grep” command to find text including subdirectories

I want to find all files which contain a specific string of text. The grep command works, but I don't know how to use it for every directory (I can only do it for my current directory). I tried ...
145
votes
4answers
184k views

How do I patch/workaround SSLv3 POODLE vulnerability (CVE­-2014­-3566)?

After the BEAST attack and Heartbleed bug, now I've heard about a new vulnerability in SSL/TLS called POODLE. How do I protect myself against being exploited? Are only servers or also clients ...
145
votes
4answers
181k views

What do the different colors mean in the terminal?

What do the different colours in Ubuntu's terminal mean? For example, when I type the ls command in one of my folders, I get one of the files in light green, the other (which is a folder) in blue with ...
144
votes
10answers
149k views

How to merge several PDF files?

There are a lot of software in Windows to merge PDF files but how can we do the same in Ubuntu?
144
votes
13answers
351k views

How to install Eclipse?

I want to install the latest version of Eclipse but the Ubuntu Software Centre contains an older version. Is there a PPA or some other way to install latest Eclipse? Please describe the steps for ...
144
votes
18answers
116k views

I have 16GB RAM. Do I need 32GB swap?

I read many places that the rule of thumb for swap space is to double the amount of physical RAM. However, 32 GB does seem a LOT. Do I need that much? Do I need it at all with this high amount of ...
143
votes
10answers
7k views

How do I delete my commands quickly?

I use terminal for almost all tasks. Let's say I have entered a huge command like this: sudo a-huge-command What is the easiest way to delete the whole command with a single shortcut, rather than ...
143
votes
3answers
452k views

What command do I need to unzip/extract a .tar.gz file?

I received a huge .tar.gz file from a client that contains about 800 mb of image files (when uncompressed.) Our hosting company's ftp is seriously slow, so extracting all the files locally and sending ...
143
votes
6answers
116k views

How to patch the Heartbleed bug (CVE-2014-0160) in OpenSSL?

As of today, a bug in OpenSSL has been found affecting versions 1.0.1 through 1.0.1f (inclusive) and 1.0.2-beta. Since Ubuntu 12.04, we are all vulnerable to this bug. In order to patch this ...
143
votes
6answers
165k views

How can I recursively delete all files of a specific extension in the current directory?

How do I safely delete all files with a specific extension (e.g. .bak) from current directory and all subfolders using one command-line? Simply, I'm afraid to use rm since I used it wrong once and now ...
143
votes
1answer
278k views

How do I configure swappiness?

I need a step-by-step, simple and easy way to configure swappiness.
142
votes
8answers
36k views

I have a hardware detection problem, what logs do I need to look into?

I am trying to ask a question about getting my hardware to work but I don't know what information to add to my question to get help, what do I need to do? Related if you don't have access to a GUI: ...
142
votes
6answers
462k views

What is the correct way to install proprietary ATI Catalyst Video Drivers (fglrx) directly from AMD?

I am planning on doing a fresh install of Ubuntu and want to know what is the correct way to install ATI Catalyst Video Driver? There are multiple valid answers for this question spanning over ...
142
votes
22answers
144k views

Tips to extend battery life for laptops and notebooks

This question is present as a matter of historical interest. While you are encouraged to help maintain its answers, please understand that "big list" questions are not generally allowed on Ask ...
141
votes
3answers
41k views

What's the right terminology for Unity's UI elements?

I've sent a few mails to the Ayatana mailing list regarding some UI suggestions for Unity, but I'm afraid I keep confusing the right terms for the UI element, so I would like to have some ...
141
votes
15answers
141k views

Is there a Google Drive client available?

I'd like to install a Google Drive client for Xubuntu (12.04). I'm getting non-English Google results, and I didn't find grive in the Xubuntu repositories. Does anyone know of a client that works ...
140
votes
12answers
431k views

How to force a clock update using ntp?

I am running Ubuntu on an ARM based embedded system that lacks a battery backed RTC. The wake-up time is somewhere during 1970. Thus, I use the NTP service to update the time to the current time. I ...
140
votes
7answers
102k views

How can I install Adobe AIR?

I am a heavy user of certain applications that are built on AIR. It appears that AIR has discontinued support for Linux. Even the older versions in the Adobe AIR Archives seem to support only 32 bit ...
139
votes
5answers
114k views

How can I get octal file permissions from command line?

There is a chmod command to set file permissions, but can I get file permissions in octal mode (such as 755) from the command line?
139
votes
4answers
356k views

How to create a soft or symbolic link?

I am installing p4v in /opt, but /usr/bin is on my path. Is it possible to create a soft or symbolic link for p4v from /opt to /usr/bin, so I can just type "p4v" since /usr/bin is in my path?
138
votes
16answers
351k views

How do I set Windows to boot as the default in the boot loader?

How do I set the bootloader so that in my dualboot with Windows 7/Ubuntu 11.04, Windows start up as standard instead of Ubuntu?
137
votes
8answers
157k views

How can I get apt to use a mirror close to me, or choose a faster mirror?

Downloading from the main Ubuntu archive is slow even when it's not release day, how can I get apt-get to automatically use a mirror that is close to me?

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