First time I tried to install Ubuntu 20.4 from CD, I had an SDHC card in the SD reader slot of my HP Envy laptop and the installation would hang. That’s when I notice that the error messages were pointing an an SD card. When I popped it off, Ubuntu installed OK.
After a successful install, Ubuntu would not read my SD Card from the laptop slot but interestingly, it would get mounted to my Windows partition after a while. Ubuntu correctly mounts and read regular SD cards (4 G) in the same slot.
Thanks to you, I tried a USB card reader and I can now read the 32G SDHC. It’s interesting that Linux Mint can read this same card directly from the built-in SD reader slot.