sudo : Unable to Resolve Host

This happens after the host-name of the system is changed. Host-name can be changed by editing the file "/etc/hostname".

   sudo gedit /etc/hostname
For resolving the host conflict, we need to edit the file "/etc/hosts". For editing this file use the command:
   sudo gedit /etc/hosts

Edit the name in front of 127.0.1.1 to the new host-name. This will do.

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Download YouTube Videos in Ubuntu 11.04

More often we need to download videos from YouTube and similar other sites. Ubuntu provides a command-line feature for downloading videos from YouTube.

For this you need to install the package "youtube-dl". This can be done by using the terminal or the synaptic package manager. For installing the package using the terminal, use the command:
      sudo apt-get install youtube-dl
You can install it through the synaptic package manager by searching the package youtube-dl in it.

Make sure you have updated the package after you have installed it. For updating the package, use the command
    youtube-dl  --update
If you get permission error, change the permissions of youtube-dl in /usr/bin using the command:
   chmod 777 youtube-dl
For downloading the YouTube video, open the terminal (press Ctrl+Alt+T) and type the command:
   youtube-dl "URL"
Open the relevant video in the browser and copy the URL from there.

After the download is completed you can find the video in your HOME folder.

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