Error loading Ubuntu

Hi installed 2 weeks before and it was working fine.
I installed some extra plugin todays when it restarted, it started giving errors.

I tried solving it for an hour but no luck.

Finally what I did is... delete .Aptana folder from home directory and again run the Aptana.

Voila!!! It worked this time.

There was an error while performing index

This error is seen often in Ubuntu 9.04. It pops up a dialog box which says "There was an error while performing index". It has 3 buttons, Re-Index, Cancel and one more (I forgot ;) ). No matter which button you click, it again pops up the same dialog box. Really very annoying :( .

I googled for it and found simple solution to it.

Delete the following files and reboot your system
1. ~/.local/share/tracker/data/ ( rm -rf ~/.local/share/tracker/data/ )
2. ~/.cache/tracker ( rm -rf ~/.cache/tracker )

That's it!!!

Installing Aptana Studio on Ubuntu

Aptana Studio is one my favorite IDEs for Web Development. It has excellent Syntax Highlighting and Code Completion for HTML, CSS, Javascript, PHP, Ruby, etc.

I have been using it for more than 2 years on Windows. I recently installed Ubuntu 9.04 Linux on my machine. I tried installing Aptana Studio on Ubuntu but to my surprise, installing Aptana on Ubuntu is not as easy as it is on Windows and Mac. I searched online alot and finally found the solution at http://maketecheasier.com/install-aptana-studio-in-ubuntu-intrepid/2009/03/23

Here are the steps to install it...

1. Download and install all dependencies. Open Terminal and enter this command

sudo apt-get install sun-java6-jre sun-java6-plugin xulrunner

2. Download Aptana for Linux from http://72.3.219.182/studio/download/thanks?platform=standalone&os=linux&ev=3.4

2. Save it in your Home Directory and Unzip it there.

3. Create one executable file. (eg. launchAptana.sh)

4. Write this in that file.

#!/bin/bash
export MOZILLA_FIVE_HOME=/usr/lib/xulrunner
/home/damien/aptana/AptanaStudio  #filepath to Aptana folder

5. Right Click on that file and give it execute permission.


Now you can run Aptana Studio by double clicking on that newly created file.

Source: http://maketecheasier.com/install-aptana-studio-in-ubuntu-intrepid/2009/03/23

Upgrading to newer Version

I had to uninstall Ubuntu from my machine due to some reason. I again installed Ubuntu 7.10 on my last night. I wanted to upgrade it to 9.04 (Jaunty Jackalope). I tried doing to using Upgrade Manager (System -> Administration -> Upgrade Manager) but it upgraded it to 8.04. I then came to know that I can not upgrade directly to 9.04. I have to pass through all the versions in between. So, I upgraded to 8.04. After upgrading to 8.04, I tried to upgrade it to 8.10 (next release after 8.04) but it did not work. I always said "System is up to date".

I googled online but found no luck (May be I did not try hard. I am a lazy ass ;-) ). Finally I got solution from http://twitter.com/be3 on Twitter.

It's very simple. Go to Console and type update-manager -d

It then upgraded to 8.10 (as I said, we need to pass through all intermediate releases). I should hopfully be able to upgrade to version 9.04. :-)

Installing / Uninstalling Netbeans

Installing Netbeans in just three steps process

1. Go to http://www.netbeans.org/downloads/start.html
2. Download the package you are looking for.
3. Open Terminal, Go the directory where Netbeans in downloaded and type sh netbeans.sh (whatever is the name of the downloaded file.)

To Uninstall,
Open the terminal, locate the directory where netbeans is installed and run sh uninstall.sh

Simple as that :-)

Command not found

I was trying to uninstall NetBeans from my Linux box. I tried sudo ./uninstall.sh but every time (just to make sure 'm typing everything correctly) it gave me Command Not Found error.

Finally, I found the solution as

chmod a+x uninstall.sh

use SH command.

sh uninstall.sh

This works perfectly. :-)

Removing unwanted files from Ubuntu

Removing unwanted (tmp) files from Ubuntu is very easy.

Open the Terminal window and run: sudo apt-get autoclean

This will delete all the unnecessary files from the computer.

This can fail if Synaptic package manager or any other installation manager is running.


source: http://www.ubuntugeek.com/how-to-fix-lock-varlibdpkglock-open-11-resource-temporarily-unavailable-error.html

SSH in Ubuntu

When I was using Vista, I used to use Putty / X-Win to SSH to my Server.
But doing that on Ubuntu (or any Linux/Unix box for that matter) is very simple.

Go to Terminal Window.

Run ssh username@hostname/IP address
Enter your password when prompted.

You can exit from SSH using exit command.

That's it.
Isn't it simple?

Note: Though Linux version of Putty is available, using Terminal Window is much simple to use.

Installing MySQL on Ubuntu

Go to Terminal Window and run sudo apt-get install mysql-server libapache2-mod-auth-mysql php5-mysql

You will be asked to enter your ROOT password. The screen looks like this
When the installation is complete, run mysql -u root -p

Enter root password when prompted.
If no error message is displayed, MySQL installation is successful.

source: http://ubuntuexperiment.wordpress.com/2008/11/10/installing-apache-php-mysql/

Installing PHP5 on Ubuntu

Go to Terminal Window and run sudo apt-get install php5 libapache2-mod-php5

Now restart the Apache Server ( sudo /etc/init.d/apache2 restart )

To test if installation was successful or not, lets create one test file, run the following command. sudo gedit /var/www/test_file.php . This will open up gedit editor. Type . Save the file and close gedit.

Now open your favorite Web Browser and go to the URL http://localhost/test_file.php

You should see something like this.

Source: http://ubuntuexperiment.wordpress.com/2008/11/10/installing-apache-php-mysql/

Installing Apache WebServer on Ubuntu

Hi,
'm coming from Windows background.
I used to use WAMP / XAMPP on windows.

Now I 've switched to Ubuntu and 'm loving it.

I was trying to install Apache WebServer on my machine. I googled a bit and found the solution. I didn't knew installing Apache on Linux could be so easy.

1. Go to Terminal Window.
2. Type sudo apt-get install apache2
3. Enter the root password when prompted.
4. When installed, open your Web Browser and go to URL http://localhost , If it has been properly installed, you should see It Work's!
5. Now try restarting the server, sudo /etc/init.d/apache2 restart . If you receive any error like

   apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
   ... waiting .apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

6. Run the command gksu gedit /etc/apache2/conf.d/fqdn . This will open up GEdit. Enter the following in it: ServerName localhost
7. Now you should be able to restart your Apache. Try it out :)
   
   

Source: http://ubuntuexperiment.wordpress.com/2008/11/10/installing-apache-php-mysql/

Removing file / folder forcefully

In Ubuntu (or any Linux based OS for that matter) have all folders starting with . (period) as hidden.
These folders will not be displayed with run ls command.

If you want to see the hidden files too, use ls -l command.

I was trying to delete one folder containing 2 files (I guess they are worms / virus in windows) Desktop.ini and Folder.htt . I tried deleting it using Delete Button on Keyboard. I also tried Shift+Delete (I know it doesn't matter) but it didn't work.

Finally after googling a little, I found the solution.
Forcefully delete them.

1. Open terminal
2. Go to the folder you wish to delete.
3. Delete all the files in that folder using sudo rm * (enter your root password when prompted).
4. Now go up one directory using cd .. command.
5. Now run sudo rmdir foldername
   

Extracting RAR file on Ubuntu

I recently installed Ubuntu on my machine.
I had Vista earlier. I was fed up of Vista.

This is Ubuntu is awesome. Never gets freezed.

I got some ebooks, I needed urgently, from one of my friends. But it was in .RAR format.

I was wondering if there's any RAR extractor for Linux.

I used to use WinRAR on Windows.

I searched online and found the command to install it on my machine.
It's simple.

Open Terminal (On Ubuntu: Application -> Terminal)
Type: sudo apt-get install rar

and it's done.

How to use UNRAR?

Type: unrar help
You will see bunch of options that can be used with unrar.

To just extract the files on your current drive, use..
unrar e filename.rar