While the Windows version can open Pages files, the command line conversion doesn’t seem to work on Linux. What am I doing wrong? 
Debian 11
LibreOffice 7.3.5.2 30(Build:2) <—from debian-backports
libetonyek-0.1-1 (and libetonyek-tools) are installed
Command lines tried are for example
libreoffice --infilter=“writer_pdf_export” --headless --convert-to pdf file.pages
and
libreoffice --infilter=“Apple Pages” --headless --convert-to odt file.pages
Both PDF and ODT conversions produce single-digit-kB files with blank content. The input file used is just a test file created with an Apple template, containing text and images.