Here I am showing step by step guide to install Gaussian software in your ubuntu-desktop or any UNIX platform as well in the HPC server.
Extract the Gaussian from its .tar.gz file using the following command
tar -xzvf G09-E01.tar.gz
g09 folder will be extracted which contains the necessary executable files.
Make a scratch directory and use the command "pwd" to know the path to scratch.
Edit the .bashrc script using "vi" command
Define Gaussian root, scratch, and source the g09.login or g09.profile in the .bashrc script as mentioned.
GAUSS_SCRDIR="/home/username/path to scratch folder"
export g09root GAUSS_SCRDIR
Source the .bashrc script using the command,
Test run your test job
If you get an error like Gaussian09 Error (l1.exe omode 33261 compare 7), then no need to be worry, just put the following command.
chmod -R 700 /home/username/path_to_Gaussian/g09
I hope this will be helpful for computational chemistry researchers in the Gaussian installation.