Traditionally, Ubuntu has used various methods for starting services at boot such as upstart or rc.local for scripts.
The default screensaver behavior in Ubuntu is for the screen to lock after 5 minutes of inactivity.
Ubuntu has supported workspaces for over a decade now.
Back in the day, Ubuntu used to have a dedicated swap partition, and it was recommended to allocate 2x the installed RAM to this swap partition.
Installing printers on Linux is a highly variable task.
Deleted files in Ubuntu are normally moved to the trash.