109
votes
10answers
71k 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 ...
109
votes
5answers
359k views

How to format a USB or external drive?

Using Ubuntu 11.10, how do I format an external or USB drive? I don't find an option to 'format' when I right click. In the new version, the drives don't come up on the desktop but instead come on ...
109
votes
11answers
112k views

How do I install Ubuntu to a USB key? (without using Startup Disk Creator)

If you are hurrying to reply, System → Administration → StartUp Disk Creator -- no, that's not what I'm talking about. I want to try Ubuntu 11.04's Unity without touching my existing Ubuntu ...
109
votes
6answers
229k views

What is the correct way to completely remove an application?

I've searched the net for such information and found different command lines, like these ones: sudo apt-get remove application sudo apt-get remove application* sudo apt-get remove --purge ...
109
votes
6answers
64k views

What software can I use to view epub documents?

What software can I use to view .epub documents?
107
votes
32answers
342k views

How do I download a YouTube video?

For a school project I need to download three youtube videos and save them to a CD. I am running Ubuntu 10.10; can anybody provide instructions on how to do this? I'm fairly new to Ubuntu so the more ...
107
votes
4answers
92k views

What is the difference between adduser and useradd?

What is the difference between the commands adduser and useradd?
107
votes
4answers
79k views

Why is “No new release found” when upgrading from a LTS to the next?

I'm following the upgrade instructions on Ubuntu's website, but on launching the upgrade tool I get this response: Checking for a new ubuntu release No new release found Am I doing something wrong? ...
106
votes
6answers
36k 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 ...
106
votes
2answers
238k views

How to install Skype 4.3?

Skype 4.3 is just released with considerable improvements. As a regular Skype user I want to use the latest Skype on my Ubuntu 14.04, but there is no updates from Update Manager. Even in Skype website ...
106
votes
9answers
168k views

How do I get the CPU temperature?

How do I get the CPU temperature.
106
votes
4answers
262k 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?
106
votes
4answers
76k views

How do I install the latest TeX Live 2012?

Ubuntu 12.04 still includes the outdated and obsolete 2009 version of TeX Live. Other than installing manually from the TeX Live website, is there any alternative to install the latest 2012 version on ...
105
votes
5answers
151k views

How can I fix a 404 Error when using a PPA or updating my package lists?

PPA seems to be constantly offline. Whenever I use sudo apt-get update, this error is shown: W: Failed to fetch http://ppa.launchpad.net/ 404 Not Found How do I fix these errors?
105
votes
4answers
82k views

How do I set focus follows mouse?

Is there a way to set up "focus follows mouse" behavior in Unity?
103
votes
6answers
582k 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 ...
103
votes
12answers
96k views

How can I tell Ubuntu to do nothing when I close my laptop lid?

I would like closing the laptop lid to be a no-op. How can I do that?
103
votes
9answers
7k views

What's the difference between package managers?

I know Ubuntu/Kubuntu has several programs that can be used to install packages, such as apt-get, aptitude, and synaptic (and perhaps others). What are the differences between them, and which one is ...
102
votes
3answers
61k views

How do I revert Alt-tab behavior to switch between windows on the current workspace?

Enabling Bias alt-tab sorting to prefer windows on the current viewport as described here made no difference. How can I get back the exact same behavior as 11.04, so that alt-tab only switches between ...
101
votes
18answers
67k views

How do I create a desktop wallpaper slideshow?

How do I create a desktop wallpaper slideshow with my own set of images? With the images coming from a pictures folder, or pre-selected With the images displayed in order, or randomly With the ...
101
votes
16answers
136k views

How can I create launchers on my desktop?

In older versions it was easy to create a launcher on my desktop all i had to do is right click on my desktop and select the create launcher option. But on 11.10 the option disappeared from the menu.. ...
101
votes
2answers
223k views

cannot change screen size from 640x480 after 14.04 installation on VirtualBox OSX [duplicate]

After installing Ubuntu 14.04 guest on VirtualBox running on a Max OSX host, I am stuck with 640x480 screen resolution. Adding guest additions again doesn't help. Previous Ubuntu installations are ...
101
votes
6answers
89k views

How can I configure Unity's launcher auto-hide behavior?

This has been an issue for me with Unity since its release. I'd like to make the the launcher auto-hide. Especially on Netbooks, where screens are small, the launcher is quite wide, making it ...
101
votes
1answer
103k views

What are the meta, super, and hyper keys?

In System -> Preferences -> Keyboard -> Layout -> Options ->Alt/Win key behavior What do meta, super, hyper mean?
101
votes
10answers
61k views

What can replace system monitoring in the top Gnome Panel in Unity?

I'm used to have System monitoring in the top Gnome Panel: CPU, Temperature, Net, Fan-Speed. (see screenshot below) In Unity, the Top Panel is locked for window name and global menu, so I can't add ...
100
votes
9answers
55k views

How do I disable overlay scrollbars?

It looks like Ubuntu 11.04 will come with overlay scrollbars by default. I do like them, but I don't like the current mix of scrollbar types as many applications don't yet use those overlay ...
100
votes
10answers
399k views

How to burn a .iso to a USB device?

I want to burn a Windows ISO to a USB device in Ubuntu. How do I do this? I know how to burn a Ubuntu ISO into a USB device, but with a Windows ISO it's not the same.
99
votes
10answers
107k views

Progress and speed with 'cp'?

When copying files using cp, is it possible to display the progress and speed of the transfer? Otherwise, is there any alternative command line utility that can achieve this?
99
votes
23answers
138k views

Ubuntu gets stuck in a login loop

My problem: As you can guess 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'm a Ubuntu ...
99
votes
2answers
188k views

How to enable mod_rewrite in Apache?

I just installed the LAMP stack on my Ubuntu system. The redirection is not working for me. I don't know how to fix it. Can anyone help me?
99
votes
5answers
197k views

How do I install curl in php5?

I currently have PHP 5.3 installed with Apache in 10.04 Lucid. How can I add the PHP Curl libraries? Do I need to install any other dependencies for curl?
99
votes
4answers
46k views

What is different about the Mac ISO image?

http://cdimage.ubuntu.com/releases/11.04/release/ At that location there is an ISO image which is described as "This image is adjusted to work properly on Mac systems." What specific problems on the ...
99
votes
5answers
28k views

Why is Wayland better?

As recently announced by Mark Shuttleworth, Ubuntu will be moving towards using Wayland as its display manager. What are biggest differences between X11 and Wayland? Why will Wayland make Ubuntu ...
99
votes
5answers
40k 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 ...
99
votes
6answers
22k views

Best way to cache apt downloads on a LAN?

I have multiple Ubuntu machines at home and a pretty slow internet connection, and sometimes multiple machines need to be updated at once (especially during new Ubuntu releases.) Is there a way where ...
99
votes
12answers
135k views

What are some GUI clients for Git?

I am using git for version control of various projects. Is there easy-to-use software for navigating through commits and branches of a project and for retrieving versions?
98
votes
15answers
388k views

How do I add a DNS server via resolv.conf?

Is /etc/resolv.conf useless in Ubuntu 12.04 LTS (Precise Pangolin)? I see that the DNS server information is stored in NetworkManager now. The nmcli command line tool can list that for you. If I ...
98
votes
11answers
168k views

How do I install Java?

How do I install Java, including in my browser, so websites with Java work?
98
votes
7answers
114k views

Is there a program like Microsoft Paint? [duplicate]

Greetings, I'm slowly getting used to Ubuntu; for I've been a Windows user as long as I've used any computer. I'm hoping someone can suggest a good graphics software. I'm simply looking for one ...
97
votes
8answers
33k views

Is there an easy way to rearrange or move the icons in the Unity launcher?

It looks like the only time that you can choose where an icon goes on the unity launcher, is when you add it. Is there a way to rearrange the order of an icon after it has been added?
96
votes
7answers
52k views

Missing date & time applet from top Unity panel

I like Unity very much. Recently, I installed Compiz manager and Nautilus Elementary also then tried to Play. During some of my playing around, Unity's clock applet has vanished. I want to make it ...
96
votes
10answers
278k 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 ...
96
votes
15answers
98k views

How can I find the version of Ubuntu that is installed?

I installed some version of Ubuntu on my VMware, but I don't know what version exactly it is. How can I find it out?
96
votes
9answers
40k views

There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?

I've been running Alpha releases of Ubuntu for some time now. I keep running into issues - how can I get these resolved? What should I do when I encounter these problems? And where can I find other ...
96
votes
6answers
61k views

What is the easiest way to resolve apt-get BADSIG GPG errors?

I frequently cross this issue, and always have to google for an answer. Does anyone have a permanent fix for BADSIG errors from apt-get? W: GPG error: http://download.virtualbox.org lucid ...
96
votes
5answers
114k views

How to Downgrade a Package via apt-get?

How to downgrade a package to an older version via apt-get?! Another tools are also accepted but apt-get is preferred.
96
votes
2answers
181k 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 ...
95
votes
19answers
27k views

Why is it bad to login as root?

I've often come across posts on forums or other websites where you see people joking in such a manner about running/logging in as root as if it's something awful and everyone ought to know about it. ...
93
votes
12answers
126k views

How to modify a invalid /etc/sudoers file? It throws out an error and not allowing me to edit again

How do I edit an invalid visudo file? Here is what happens: $ sudo visudo >>> /etc/sudoers: syntax error near line 28 <<< sudo: parse error in /etc/sudoers near line 28 sudo: no ...
93
votes
17answers
93k views

What are the differences between 32-bit and 64-bit, and which should I choose?

What is the difference between 32-bit and 64-bit Ubuntu? I've heard the 64-bit platform performs better and can detect more than 4GB of RAM. Also, while some apps haven't ported to 64-bit yet, ...

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