I have a Lenovo T410 laptop running Bookworm (12.11 according to
/etc/debian_version). It's been running perfectly for months without
a re-boot - but after a re-boot today (more on this later) it can no
longer find network hardware, either wi-fi or Ethernet. "ip addr" and
/etc/network/interfaces only contain entries for the loopback device
(lo); /etc/network/interfaces.d is empty. Aside from the loss of
networking, the machine seems to be running normally (although
VirtualBox can no longer bring up a Windows XP virtual machine
which uses the networking hardware).