Have you tried Xournal?  You can open PDF documents, type on them, draw on them,etc and then save them back to PDF. 
JD


On Tue, Apr 19, 2022 at 7:22 PM joe--- via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
Today, I tried to use Libre Office to fill in
a pdf document form and I managed to get the
text filled in, but I was unable to get the
checkbox to work. Any help out there?

I uploaded a screen shot example here:

https://upquick.com/temp/pdf-in-libre.jpg

I managed to get an "X" in a text box once,
but as soon as I move to the next field,
the "X" that I got there temporarily vanishes.

--------------------
google: libre office fill in pdf form
How to convert a PDF document to a fillable form in LibreOffice
ask.libreoffice.org
How to fill in a PDF in LibreOffice?
Convert a PDF document to a fillable form in LibreOffice
1 Click “View → Toolbars → Form Controls”
2 Add your input fields.
3 Click “File → Export as PDF”
4 Select checkbox “Create PDF Form”
5 Click “Export”

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