Is filemanager-actions working with 19.04?

The FMA is installable from universe pocket since Ubuntu 19.04 (disco dingo) with

sudo apt-get install filemanager-actions

Then you need to run fma-config-tool (FileManager-Actions Configuration Tool) and make sure that you have checked checkboxes

Nautilus Item
[v] Display item in selection context menu
[v] Display item in location context menu

and have saved settings.

The documentation is available from official help which is available from fma-config-tool with F1 (or with yelp ghelp:fma-config-tool).

Then you need to install Nautilus Actions package with

sudo apt-get install nautilus-actions

then restart Nautilus with nautilus -q.

The corresponding menu item will be shown in the right mouse click menus:

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Note: the actions set in fma-config-tool will be shown in Caja in Nemo too. In these cases we need to install corresponding caja-actions and/or nemo-extension-fma packages.