( For Ubuntu Operating System )

Go through this Manual to Understand the Installation Process →

https://heasarc.gsfc.nasa.gov/docs/software/heasoft/linux.html#source

Step 0: Download the HEAsoft file -

https://heasarc.gsfc.nasa.gov/docs/software/lheasoft/download.html

Step 1: Choose a Location to Untar HEASoft

You can untar the HEASoft source in any directory where you have write permissions. A clean and recommended location is inside your home directory, for example:

mkdir -p $HOME/softwares
cd $HOME/softwares

Now move the downloaded HEASoft source .tar.gz file here (software folder) if it's not already in this folder.

Step 2: Untar the HEASoft Source

Assuming your downloaded file is named like heasoft-6.34src.tar.gz, run:

tar -xzf heasoft-6.34src.tar.gz

This will extract the source into a directory like heasoft-6.34/.

Now change into that directory:

cd heasoft-6.34