I won't lie: it's easy to add or remove startup apps, commands, and scripts in Ubuntu. Just open the Startup Applications tool, click 'Add', and away you
They absolutely do have “Startup Applications” in gnome not sure what the article is describing but I usually use gnome-tweak which offers a simple interface that shows currently running apps and a list of all apps and easily lets you select them to start at boot
Wait… They don’t have that in Gnome? (I use KDE)
They absolutely do have “Startup Applications” in gnome not sure what the article is describing but I usually use gnome-tweak which offers a simple interface that shows currently running apps and a list of all apps and easily lets you select them to start at boot