I plugged in my Kindle to add books to it, and the PC didn’t recognize it. The Kindle saidit was connected, but neither Thunar nor lsblk showed a device. It also happened when I tried to add things to my USB drive, and there wasn’t an sdb in lsblk. Is there a problem with my PC?
Can you tell if your kindle is being charged when you plug it in to your computer’s usb slot?
If not, you might want to use a different usb-cable… 