I was seeing a number of
print_req_error: I/O error, fd0, sector 0 on an Ubuntu Server 18.04 virtual machine. It's running in Hyper-V, and there is no floppy configured in the Hypervisor.
There was nothing in
fd0. After a bit of searching I found this procedure which resolved the issue.
$ echo "blacklist floppy" | sudo tee /etc/modprobe.d/blacklist-floppy.conf $ sudo rmmod floppy $ sudo update-initramfs -u $ sudo shutdown -r now