
For Debian 9.x + MATE Desktop 1.16.x:

Go to System > Preferences > Startup Applications. "Add"

Create a new startup program:

Name: Startup Sound
Command: paplay /YOUR/PATH/FILE/SOUND

Example: paplay /home/tuxkernel/MATE/Windows95/Sounds/STARTUP.wav

Comment: Startup Sound.

Done.

NOTE: For other distros (Ubuntu, Linux Mint, etc.) and DE's (GNOME, KDE, etc.), check their installation on internet.
