While the approach suggested by @DK Bose within the comments is completely correct, another possible solution is to create custom keyboard shortcut that uses xdotool as command in the following way:
xdotool type --clearmodifiers 'µ'
Source of the idea is provided within the comments of this answer. xdotool should be installed:
sudo apt install xdotool
This shortcut (Ctrl+Shift+M as it is defined above) works also within wine applications, the only specific thing is that you should press Ctrl+Shift for about 1 second and then press M.
When typing in libre office:
From the menu bar select insert, special character
This displays lots of different characters including the one asked for in the question.
While the approach suggested by @DK Bose within the comments is completely correct, another possible solution is to create custom keyboard shortcut that uses
xdotoolas command in the following way:Source of the idea is provided within the comments of this answer.
xdotoolshould be installed:This shortcut (Ctrl+Shift+M as it is defined above) works also within
wineapplications, the only specific thing is that you should press Ctrl+Shift for about 1 second and then press M.When typing in libre office: From the menu bar select insert, special character This displays lots of different characters including the one asked for in the question.