I have just done a fresh install of Ubuntu 21.10 for Raspberry Pi ARM64 in order to try out the new release.

After performing an apt upgrade and updating the iscsi initiator name I tried to run

sudo iscsiadm --mode discovery --type sendtargets --portal 10.1.0.20

but I got the following error

iscsiadm: read error (-1/104), daemon died?

iscsiadm: Could not scan /sys/class/iscsi_transport.

libkmod: ERROR ../libkmod/libkmod-module.c:838 kmod_module_insert_module: could not 

find module by name='iscsi_tcp'

iscsiadm: Could not insert module tcp. Kmod error -2

iscsiadm: iSCSI driver tcp is not loaded. Load the module then retry the command.

iscsiadm: Could not perform SendTargets discovery: iSCSI driver not found. Please make sure it is loaded, and retry the operation

modprobe iscsi_tcp shows

modprobe: FATAL: Module iscsi_tcp not found in directory /lib/modules/5.13.0-1008-raspi

How can I enable / install / compile this missing kernel module?