Re: [Trisquel-users] Import pdf on Libreoffice

[mikko . viinamaki]

And in case the PDF consists of images (of text) rather than text, you need  
to OCR it.

https://en.wikipedia.org/wiki/Optical_character_recognition
OCR's success depends on the quality and contrast (etc) of the source  
material. It's likely you need to proofread the text however. There are  
various tools in the repos.