To install the AVR environment in Ubuntu Linux:

1. Create a directory called /opt to place the downloaded AVR tools.
   Do this by typing:

    sudo mkdir /opt 

2. Then, download all the tools by first going to Microchip's well-hidden website:
   AVR and Arm Toolchains (C Compilers)

3. Scroll down to GCC Compilers for AVR and Arm-Based Devices.
   Select the link: AVR 8-bit Toolchain (Linux) 3.7.0
   Click on it to download the file:

    avr8-gnu-toolchain-3.7.0.1796-linux.any.x86_64.tar.gz 

4. Once downloaded, move the file into the /opt directory you created.
   

   sudo mv avr8-gnu-toolchain-3.7.0.1796-linux.any.x86_64.tar.gz  /opt

   Hint: Use file completion to prevent errors

5. Within /opt, unzip and untar the file with:

   sudo tar zvxf avr8-gnu-toolchain-3.7.0.1796-linux.any.x86_64.tar.gz

6. If not installed, install

    sudo apt-get install vim 

7. Now, we need to tell your system where to look for these tools. To do this,
   we alter your $PATH variable. Do this by editing the file

   ~/.bashrc

   That's a tilde, not a hyphen. At the bottom of the file, add this line:

   export PATH=/opt/avr8-gnu-toolchain-linux_x86_64/bin:$PATH

   This prepends the new path to the avr executables to your existing $PATH.

8. This change will not be recognized by the OS until you rerun the .bashrc file
   or logout and back in again. To avoid this:.

   cd; source $HOME/.bashrc

9. Download and install the programmer utility avrdude 6.3.

    sudo apt-get install avrdude

   Ubuntu automatically knows to look where avrdude will be installed.