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142
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2 answers

GPG error: The following signatures couldn't be verified because the public key is not available

Possible Duplicate: How do I fix the GPG error “NO_PUBKEY”? after sudo apt-get update I get this error: W: GPG error: http://archive.hivemind.me all Release: The following signatures couldn't be verified because the public key is not available:…
PabloJimeno
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142
votes
4 answers

No Host only adapter selected

I have a problem with my virtualbox on ubuntu 12.04, I can't add a host only adapter, the message is "no host only network adapter selected" I can't select anything can anyone solve this problem??
Ujang Karnadi
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142
votes
3 answers

How do I keep track of failed SSH log-in attempts?

I'd like to see if somebody has been trying to log-in by brute-force into my Ubuntu 12.04 server over SSH. How can I see if such activities have been taking place?
Ivan
  • 58,865
142
votes
4 answers

How to repair a corrupted FAT32 file system

I'm using the FAT32 file system for my pen drive. It frequently has file/data corruptions. In Windows, I used the scan disk utility to fix the FAT32/NTFS file systems. How can I do this in Ubuntu?
Chalitha
  • 1,423
141
votes
11 answers

How can I convert audio from MP4 or FLV video files to mp3?

Is there an application that allows me to extract the audio from a MP4 or FLV video file and store it as an MP3 file for use in a portable media player?
b-ak
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141
votes
9 answers

How to copy & paste from Ubuntu VirtualBox guest to Windows host?

I am running VirtualBox 4.1.4 on my Windows 7 laptop, running an Ubuntu 11.10 guest. I would like to copy text from Ubuntu's terminal and paste it into a file on the Windows host. This doesn't work for some reason. Any ideas?
Misha Moroshko
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141
votes
3 answers

Why is my network interface named enp0s25 instead of eth0?

A lot of my scripts stopped working after installing Ubuntu 15.10 and I have trouble remembering this new name as I was used to ethx and wlanx for years. Is there a reason for this change? Do I have to get used to this or can I just rename it and go…
Mike
  • 5,951
141
votes
9 answers

How do I check if Ubuntu is using my NVIDIA graphics card?

The reason I'm asking is that none of the games I've installed through software center that require 3D accelartion like TORCS for instance will run. When I try to run then, nothing happens. I have a Dell Inspiron N5110 with a nVidia GeForce GT 525M.…
Nic
  • 1,411
141
votes
12 answers

Apache not able to restart

Trying to restart apache from terminal using the following command: sudo service apache2 restart When executing that command, I'm getting below error: Job for apache2.service failed. See "systemctl status apache2.service" and "journalctl -xe" for…
Gautam Savaliya
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141
votes
8 answers

How to install cmake 3.2 on Ubuntu

Default cmake version of 14.04 is 2.8. How can I install cmake 3.2 and replace the default one? Or how can I upgrade 2.8 to 3.2?
ycshao
  • 1,541
141
votes
8 answers

What's the easiest way to unrar a file?

I just realized I can't unrar .rar files on my Ubuntu machine! What's the easiest way to accomplish this fundamental task? If possible I'd love something like 7Zip that I can just right Click, and extract and have the program worry about how to do…
Only Bolivian Here
  • 8,147
141
votes
15 answers

How do I open the Application Launcher on KDE with just the meta ("Windows") key?

How do I open the application launcher ("start menu") of Kubuntu with my Windows key? Similar to how the Start menu in Windows is opened. I don't want to use Alt + F1 .
sushi2141
  • 1,413
141
votes
6 answers

How can I send a custom desktop notification?

I have a custom script and I want to send a desktop notification (the one that appears in the top right corner of the screen) with a custom message. How do I do that?
January
  • 37,288
141
votes
3 answers

Set variable in .desktop file

Is there a way to set the enviroment variable in .desktop file? I'm trying to run application (eclipse) with custom gtk style, so basically I want to get the following result by runing a .desktop file: GTK2_RC_FILES=gtkrc.custom /path/to/eclipse…
dotintegral
  • 1,413
140
votes
15 answers

How do I set the default program?

How do I set the default program that I use? I have tried to open System Info → Default Program → change my program, but it won't work, Any idea? Or should I use Terminal? I want to replace the default movie player with VLC media player, because the…
Halim
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