From the release notes:
Various kernel modules have been moved from the linux-modules-raspi package in order to reduce the initramfs size. This results in several applications (most notably Docker, bug 1947601 18) failing due to missing kernel modules. To work around this:
sudo apt install linux-modules-extra-raspi
See: https://bugs.launchpad.net/ubuntu/+source/zram-config/+bug/1947697 Apparently the zram module (among others) is no longer there by default on 21.10. It can be installed through the linux-modules-extra-raspi
From the release notes: Various kernel modules have been moved from the linux-modules-raspi package in order to reduce the initramfs size. This results in several applications (most notably Docker, bug 1947601 18) failing due to missing kernel modules. To work around this: sudo apt install linux-modules-extra-raspi