12 Nov 2020, 23:30

@LoneSt4r Are you using the latest official version, or are you using a ready-made image from the internet?

Used "dd" on Linux to copy the image to the SD card

Unfortunately I don't know much about Linux, but, it's not just copying the official image to the SD card: you need to Flash it, using Etcher, or Rufus, or Raspberry pi Imager (I don't know the program and the Linux command for that ).

Enlarged the partition to fill the whole SD card

You do not need to expand any partitions: Do a flash, and after that, try to start Recalbox. The system will automatically create the SHARE partition as large as possible (the first boot takes the longest because of that, wait for the first boot until the end).