Greatest Hits

29
votes
6answers
139k views

SSH connection problem with “Host key verification failed…” error

I can connect to another Ubuntu machine in my LAN via SSH. On both of then PC's I installed openssh-server but from another Ubuntu computer I can not connect to my PC via SSH and I got this error: ...
160
53
votes
10answers
92k views

Unable to mount Windows (NTFS) filesystem due to hibernation

Whenever I boot Ubuntu, I get a message that it cannot mount my windows partition, and I can choose to either wait, skip or manually mount. When I try to enter my Windows partition through Nautilus I ...
30
votes
4answers
108k views

How do I uninstall Mysql?

I installed Mysql using sudo apt-get. Now I need to remove it from my system. How can I do that?
127
votes
13answers
174k views

How do I start applications automatically on login?

How can I make an application automatically start when I have logged in?
126
11
votes
2answers
24k views

Ubuntu 14.04 not booting after error message. /tmp could not be mounted

I recently installed Ubuntu 14.04 using WUBI and after installation when it booted it showed an error: Serious errors were found while checking the disk drive for /. There were three options: ...
47
votes
2answers
83k views

How to add programs to the launcher?

How can I add new programs to the launcher in Ubuntu?
152
14
votes
1answer
92k views

How do I configure my DNS settings in Ubuntu server?

According to this page it appears to be simple. However, /etc/bind does not exist on the default installation of Ubuntu 12.04.3 LTS server. So, without installing any further software, how can ...
29
votes
8answers
137k views

How do I mount an SD card?

My computer has an SD card slot. When I put a working SD card into the slot, nothing happens. When I put a CD or DVD in, or plug in a USB drive, the medium is mounted and available. Is there something ...
26
votes
3answers
99k views

How to access phpMyAdmin after installation?

I've installed phpmyadmin sudo apt-get install phpmyadmin. Of course, I have also mysql and a web server running properly. Now how can I reach it?
63
votes
5answers
138k views

How to check hard disk performance

How to check the performance of a hard drive (Either via terminal or GUI). The write speed. The read speed. Cache size and speed. Random speed.
34
votes
6answers
87k views

Wireless card Realtek RTL8723AE-BT is not recognized

I bought a new laptop with a RTL8723AE-BT wireless card, but it seems there is nothing that makes it work. Realtek usually makes drivers available for its card, but this specific one doesn't have a ...
8
votes
5answers
47k views

How do I install iTunes on Ubuntu?

I've tried different ways to install iTunes, but to no avail. I tried with Wine, but it didn't work. Can I have iTunes on Ubuntu.
103
93
votes
10answers
71k views

How do you monitor the progress of dd?

dd is a wonder allowing you to duplicate a hard drive to another, completely zero a hard drive, etc. But once you launch a dd command, there's nothing to tell you of it's progress. It just sits there ...
13
votes
2answers
52k views

How to install the MPEG-4 AAC decoder and the H.264 decoder?

Where do I get the MPEG-4 AAC decoder, and the H.264 decoder. How to install them and play the multimedia?
5
votes
2answers
78k views

How do I use Unetbootin to make a bootable Windows USB installer?

it says missing bootmngr or something like that. I'm on ubuntu 12.04 or whatever, the newest one using the gparted to format to NTSC and then unetbootin to install the bootloader, and the iso, then ...
70
votes
1answer
70k views

What is the “show desktop” keyboard shortcut?

I just upgraded to 11.10 from 11.04. Previously the shortcut to show the desktop was Super key + D (same as in Windows), But now it is not working. What is the new shortcut?
18
votes
8answers
63k views

Unable to start VMWare Workstation after upgrade to 13.04

After upgrading to 13.04 I am unable to start VMWorkstation. I get the following message: Before you can run VMware, several modules must be compiled and loaded into the running kernel. ...
4
votes
3answers
62k views

ERROR 1045(28000) : Access denied for user 'root@localhost' (using password: no )

I got a problem with mysql server Actually i am not sure im tring to install queXS cati app on my ubuntu desktop i installed mysql server and php5 and when im trying mysql -u root it says ...
24
votes
6answers
41k views

Chromium 34 and later cannot detect flash plugin

I've deleted ~/.macromedia and ~/.adobe contents and after a restart chromium can't detect flash plugin. It works just fine in Firefox I have only Chromoting Viewer on chrome://plugins/ ...
34
votes
3answers
98k views

Shutdown does not power off computer

I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520. I encounter a problem whenever I shutdown or restart; it kills all running processes ...
23
votes
8answers
92k views

What are the alternatives to Notepad++ on Ubuntu?

I use Notepad++ on Windows 7 and I want to know if there is a good substitution for it on Ubuntu. I want something that is good for editing html files.
76
votes
5answers
112k 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?
64
votes
4answers
54k views

YouTube movies are playing too fast with chrome

I've got movies playing in fast forward in YouTube HTML 5 mode if I play it in Google Chrome. If I open it with Firefox, it plays well. Any ideas?
43
votes
14answers
64k views

How to add a “Show desktop” icon to the launcher?

I recently upgraded from 10.04 to 12.04, and there is no show desktop in the launcher. I know I can use Ctrl+Super+D, but is there a way to get it in the launcher? Edit: I just installed the "show ...
66
votes
6answers
100k views

Whats the simplest way to edit and add files to “/var/www”?

Having installed the web server is there a simple way to set a user able to use the graphic interface to copy files and directories to the local web server /var/www I gave myself administrative ...
31
votes
8answers
152k views

How do I run a 64-bit guest in VirtualBox?

I would like to have an Ubuntu 11.04 64-bit test environment. When I try booting the Ubuntu 11.04 64-bit installation CD in VirtualBox, the following message is displayed by VirtualBox: VT-x/AMD-V ...
34
votes
4answers
91k views

Unable to correct problems, you have held broken packages

After upgrading from 10.04 to 12.04 I am trying to install different packages. For instance ia32-libs and skype (4.0). When trying to install these, I am getting the 'Unable to correct problems, you ...
131
39
votes
4answers
141k views

How to access a usb flash drive from the terminal? (How can I mount a flash drive manually?)

I only have access to the command line I need to backup my data (on the user folder) to a pen. I don't know where/how can I do this is order to access the pen, and then do the cp command. How can ...
23
votes
3answers
163k views

How to run a checkdisk?

I suspect there might be bad sector on a disk. What tool is the best equivalent of the error checking tool of windows? (I used ext3)
115
67
votes
5answers
120k 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 ...
12
votes
10answers
48k views

After upgrading to 13.04 Unity interface is not showing

I've upgraded to Raring last night. The upgrade itself went okay, no errors. But when I rebooted the computer afterwards and logged in to my Unity session, all I could see was the Desktop background ...
176
80
votes
3answers
52k views

How to use Alt+Shift to switch keyboard layouts?

I recently upgraded to Ubuntu 13.10, with the new keyboard handling system. The little "switch keyboard" option does not let me set it to Alt+Shift. How can I get this keyboard binding, as I have ...
16
votes
2answers
128k views

Install gcc on Ubuntu 12.04 LTS

When I try to install gcc on Ubuntu 12.04 LTS Server with apt-get install gcc, I get the following error: The following packages have unmet dependencies: gcc : Depends: cpp (>= 4:4.6.1-2ubuntu5) ...
29
votes
3answers
22k views

Missing System Settings after removing some packages

I installed or uninstalled some packages. I do not even remember what I was doing. As a result, now I can't see most of the system settings in settings window. Any idea how to solve this problem. ...
31
votes
9answers
124k views

How to update kernel to the latest mainline version without any Distro-upgrade?

Currently I'm running Linux-3.0 and I want to update it to Linux-3.3.1 the latest stable kernel release as mentioned at http://www.kernel.org. Can I update to 3.3.1 in Ubuntu without any risk of ...
93
votes
4answers
72k views

How do I set focus follows mouse?

Is there a way to set up "focus follows mouse" behavior in Unity?
12
votes
4answers
114k views

How to kill and to start the X server?

In 12.04 How do you kill the X server from the command line and from the GUI interface and how do you start it from the virtual terminal?
126
26
votes
21answers
83k views

How can I access Flash files from streaming websites?

In Maverick, there was an option to download Flash videos from sites like YouTube, Vimeo, etc. by copying the flashxx** file in /tmp directory to another location before closing the window. But in ...
42
votes
6answers
82k views

How do I download and install Handbrake?

I'm new at Ubuntu so I don't know very well how to use the terminal in order to download and install programs that aren't in the software center. I've tried without success downloading and installing ...
59
votes
10answers
80k views

Desktop does not show when I installed nvidia drivers!

The desktop does not show after I installed nvidia experimental drivers. I tried nvidia simple proprietary drivers, and they did not work either. Here is how it looks. This is not cropped or any ...
33
votes
12answers
54k views

Ubuntu on Lenovo Yoga 2 Pro

Is it possible to install Ubuntu on the new Lenovo Yoga 2 Pro? I have checked the Lenovo compatibility lists on the Ubuntu site, but no new entries have been created yet for this model (released ...
238
votes
6answers
62k views

How do I modify or disable the HUD's use of the Alt key?

A number of games, Emacs, and the terminal make extensive use of the Alt key. Can Unity be configured to respect this key, rather than launching the HUD with it?
39
votes
7answers
80k views

How to install a LibreOffice Dictionary (Spelling Check, Thesaurus…)

What are the steps to install the Spelling Check and other language supports for LibreOffice. For example spanish, french, italian, etc..
23
votes
4answers
73k views

Installing Java 7 Update 25 on 12.04 LTS?

How can I install Java on Ubuntu 12.04? I have: Java(TM) SE Runtime Environment (build 1.7.0_21-b11) Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
80
votes
2answers
124k 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?
150
48
votes
5answers
115k views

Command-line to list DNS servers

Is there a command to list dns servers? I tried $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR ...
71
votes
6answers
86k views

How do I setup dual monitors in Xfce?

I've got an laptop with a intel chip, and I'd like to setup dual monitors in Xfce. How do I do this?
11
votes
7answers
94k views

How to configure proxy authentication to work with Ubuntu Software Center?

I have tried put in apt config Acquire::http::proxy, and in Network>Network proxy with and without user:password@server:port and using environment variables http_proxy and https_proxy. Nothing seems ...
16
votes
8answers
24k views

Mcrypt extension is missing in 14.04 server for mysql

The php mcrypt extension on ubuntu 14.04 shows that it is installed properly, but phpmyadmin says: The mcrypt extension is missing. Please check your PHP configuration. My current php config is ...
29
votes
7answers
66k views

USB drive install of Ubuntu 12.04 Server fails - can't find components from CD-ROM

I'm trying to install Ubuntu 12.04 Server (32bit) on a machine here using a USB stick. I used the Universal-USB-Installer-1.8.9.4 which has support for 12.04 server to get the ISO onto the USB drive. ...