Ubuntu: How to install an old Firefox version

If you want to install an old version of Firefox, you just have to follow these steps:

In this case, I had Firefox 4.5.0 and now I want to install Firefox 47.0.1


First, open your terminal

1. Download firefox 47.0.1
   
   wget https://ftp.mozilla.org/pub/firefox/releases/47.0.1/linux-x86_64/en-US/firefox-47.0.1.tar.bz2
2. Unzip Firefox
   
   tar -xjvf firefox-47.0.1.tar.bz2
3. We remove the old version
   
   sudo rm -rf /opt/firefox*
4. we move the unzip firefox 47.0.1 to the firefox folder
   
   sudo mv firefox /opt/firefox
5. create symbolic link
   
   sudo ln -sf /opt/firefox/firefox /usr/bin/firefox

How to downgrade Firefox Version on ubuntu

In  this tutorial I will show you how to downgrade your firefox version in this case from firefox 47.0 to 45.

First run this command:


apt-cache show firefox | grep Version

then you will see a list of available Firefox versions:

• Version: 47.0+build3-0ubuntu0.16.04.1
• Version: 45.0.2+build1-0ubuntu1

Now, run the next command to install the desired firefox version

sudo apt-get install firefox=28.0+build2-0ubuntu2

Finally, you have to avoid upgrading to the newer version.


sudo apt-mark hold firefox

And that's all.



If for any reason you do not see the version that you want, that means that version is very old.
To install a very old version of Firefox, you need to do the following:



1. First you must uninstall your current Firefox version.

  

$ sudo apt-get purge firefox

2. Then run the following command to download firefox 47.0 source code, which comes as .tar file.

 
$ wget http://ftp.mozilla.org/pub/firefox/releases/47.0/firefox-47.0.linux-i686.sdk.tar.bz2

3. Extract the package.

 $ tar -xjf firefox-47.0.linux-i686.sdk.tar.bz2

4. Move firefox to /opt directory.

 $ sudo mv firefox /opt/

5. Create symlink in order to set the new Firefox as default.

$ sudo mv /usr/bin/firefox /usr/bin/firefox_old

$ sudo mv /usr/bin/firefox /usr/bin/firefox_old

6.  Avoid upgrading to the newer version.

$ sudo apt-mark hold firefox

Note: This is the original source [here]

How to install GIT on Ubuntu from command line

To install GIT on Ubuntu what you have to do is following these steps:

1.  Type this command on your terminal:

sudo apt install git



      2. Add your configuration:


git config --global user.email "your_email@example.com"
git config --global user.name "Your Name"

How to install Mysql on Ubuntu from command line

To install Mysql on Ubuntu what you have to  do is type  the following command:

sudo apt-get install mysql-client mysql-server

and then you will see something like this:

What you have to do there is type the  password for the root user.

and that's all.

Good luck!!!!!

How to updgrade Google Chrome in Ubuntu

If you want to upgrade your current chrome you must  open your terminal and write these commands:

  

$ sudo apt-get update

$ sudo apt-get install google-chrome-stable

It is important to note that, these commands either upgrade or  install Google Chrome on your computer.

Linux Command Shell : how to make Apache owner of folder

If  you need to make Apache owner of a specific folder, you can  achieve it , by executing the following  Linux command:

  
     chown -R apache /var/www/symfony_app/My_Folder/

This command will cause Apache is the owner of the folder and the contents in it.

How to create a symbolic Link in linux

Basically, to create a symbolic  link in Linux you have to use the  command called ln as follows:

  
    ln -s /var/www/myapp/web/ /html/customerapp

  

the command ls has two parameter the target(/var/www/myapp/web/) and the source (/html/customerapp). The target  is the existing file/diretory and the source the file to be created.

How to find which Linux distribution and version you are using?

To know  which Linux distribution and version you have installed on your computer,  follow this  steps:

1-Open your terminal
2- Type the following command

 cat /etc/issue

Output: