Step 0: ensure your backups are done properly as it should if not backup your data properly.

Step 1: Download rufus

Step 2: Download Ubuntu

Step 3: Create a USB boot drive

Step 4: Start the boot drive

Step 5: Follow instructions to install Ubuntu on the whole SSD drive.

Step 6: Enjoy Linux

Step 7: optional, figure out after some time using Linux if another distro might be better for you.