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The man page for keymaps(5) includes this quote:

Here's an example to bind the string "du\ndf\n" to the key AltGr-D. We use the "spare" action code F100 not normally bound to any key.

altgr keycode 32 = F100
string F100 = "du\ndf\n"

I created a file and copy & pasted those two lines, then ran

sudo loadkeys new_keymap

It completed without error, but AltGr-D still (either in Terminal or in LO Writer) printed the same character as before (an accented ‘o’).

What am I doing wrong?

What I’m really trying to do

I have a keyboard with some extra keys. The Mail key opens or restores my email client, Thunderbird – brilliant! I did nothing to configure this key, it worked immediately after I installed Linux Mint 19.1 Cinnamon.

The My Documents key does not work, nothing happens when it is pressed. I would like it to open the file manager (more precisely, to run the command nemo ~/Documents in Cinnamon).

showkey reports that Mail is scan code 155, and My Documents is 235.

Having found this answer https://stackoverflow.com/a/4200836/8557840 I created a keymap file containing

keycode 88 = F12
string F12 = "nemo "

but that does not change F12.

Changing the scan code to 235 does not affect the My Documents key.

I need to configure the keyboard.

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What am I doing wrong?

You are erroneously expecting the keyboard map that is applied by the loadkeys program to the built-in terminal emulator in the kernel that handles kernel virtual terminals, to apply to X11 programs. You are configuring the wrong keyboard mapping. Configure your XKB mappings.

Further reading

  • Thank you for pointing out where I am going wrong. – Peter bill Apr 14 at 17:34
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@JdeBP gave references that are very technical. After lots of reading, I found an easy way.

Menu→Preferences→Keyboard→Shortcuts→Custom Shortcuts→Add custom shortcut

There's a reference here: https://www.lifewire.com/how-to-change-the-linux-mint-cinnamon-keyboard-shortcuts-4064754

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