Since the official site no longer provides active updates, the safest and most direct way to get the original package is through the archived repositories:
While the project is now archived, you can still obtain the final stable binaries and install them manually. Where to Download the Atom .deb File download atom deb
If there are any missing dependency errors, fix them with: sudo apt-get install -f Method 2: Using the GUI Since the official site no longer provides active
Click the button and enter your password when prompted. Alternatives and Successors Method 1: Using the Terminal (Recommended) : For
Once you have downloaded the .deb package, you can install it using the terminal or a GUI tool. Method 1: Using the Terminal (Recommended)
: For those who prefer a mirror, SourceForge hosts various versions of the .deb package. How to Install Atom on Debian/Ubuntu