After updating kernel 5.11.0-34-generic wireless driver failed to recognize my laptop's WiFi card.
A quick search found an Ubuntu bug report that had exactly my symptom, which looked like:
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1938983
update-initramfs: Generating /boot/initrd.img-5.11.0-34-generic
W: Possible missing firmware /lib/firmware/i915/skl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
...
In Comment #8 Luca Ferroni (liuck) offered a fix that looked practical -- and it worked for me. Here is my version of his recommendation:
cd /lib/firmware/i915/
export url=https://anduin.linuxfromscratch.org/sources/linux-firmware/i915/
/lib/firmware/i915$ wget --spider -r -l1 $url 2>&1 | grep '^--' | awk '{ print $3 }' | grep -v '\.\(css\|js\|png\|gif\|jpg\)$' > /tmp/binlist.txt
/lib/firmware/i915$ cat ~/tmp/binlist.txt | while read a; do sudo wget $a; done
/lib/firmware/i915$ sudo update-initramfs -u -k all
Thank you Luca for the idea.
And thank you Rob Wilkerson for the download help.