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Nautilus and Thunar have a such context menu option under Properties/Permissions, but not PCManFM, Lubuntu's default file and desktop manager (at least not yet in the present v. 1.1.).

But under "Open with"/(again)"Open with"/"Custom command line", it is possible to add new custom commands.

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This creates a file with extension .desktop in ~/.local/share/applications which can be edited further so as to get a proper name and icon.

What is the command to add in this way for making a file executable?

That is: how to use sudo chmod +x filename to make it work in this way?

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The command sudo chmod +x must run in a terminal.

So, the command to add is something like:

gnome-terminal -e "sudo chmod +x %f" 

After editing the file in ~/.local/share/applications, the context menu looks like this:

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(The terminal use was inspired by this answer.)

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