Context menu delete option not found in Ubuntu 18. Do not like the extra steps of "Trash Can", want to flush immediately instead of having to take the stinky garbage out later. Have used that option since the first of the gnome/nautilus desktop iterations. Would like it back.
From the desktop, click on Files and select Home.
Files :
Move the cursor to the top of the screen and click on Edit, then Preferences from the drop down menu to open the Files Preferences window.
Select the Behavior tab, Under Trash check mark “Include a Delete command that bypasses Trash“. Click on Close.
Source : https://www.avoiderrors.com/ubuntu-delete-context-menu/
I've tested it on Ubuntu 18.10
Using Ubuntu 18.10 you will need to start Nautilus, your file manager, and click on the Application Menu at the top of your screen. This opens a menu where you may access the preferences. From there, you should be able to follow user Gounou's advice to:
Checking another page of the 18.10 Desktop guide, I see you can use the keyboard shortcut Shift + Delete to delete selected items immediately, bypassing the temporary Trash storage.
Figured it out. Open "Files" the nautilus file manager. At the top of the screen select "Files" menu option, then >"Preferences". A window will open with tabs, select "Behavior" tab and at the bottom there will be a check-mark option "Show action to permanently delete files and folders".