When I right click on a PDF and select retrieve metadata for pdf the pop up window appears but the auto indexing fails and returns could not read text from pdf. This happens even for PDFs for which I know the auto indexing works. I would greatly appreciate any help to solve this issue.
Further information
Software versions
pdftotext: version 3.02.
pdfinfo: version 3.02.
Ubuntu: 14.04 LTS.
Zotero: standalone version 4.0.23.
Installation of Zotero
I installed Zotero following the instructions detailed here.
 
    