Comment ajouter des numéros de ligne à un document LibreOffice Writer. Je cite une partie :

To Add Line Numbers to an Entire Document

Choose Tools - Line Numbering.
Select Show numbering, and then select the options that you want.
Click OK.

To Add Line Numbers to Specific Paragraphs

Choose Tools - Line Numbering.
Select Show numbering.
Press F11 to open the Styles and Formatting window, and then click the Paragraph Styles icon.
Right-click the "Default" paragraph style and choose Modify.
All paragraph styles are based on the "Default" style.

Click the Numbering tab.
In the Line Numbering area, clear the Include this paragraph in line numbering check box.
Click OK.
Select the paragraph(s) where you want to add the line numbers.
Choose Format - Paragraph, and then click the Numbering tab.
Select Include this paragraph in line numbering.
Click OK.

You can also create a paragraph style that includes line numbering, and apply it to the paragraphs that you want to add line numbers to.