Comment 3 for bug 1960164

1) launched focal lxd container
2) enabled proposed
3) installed the v5.15 based kernel
apt install linux-generic-hwe-20.04-edge
4) disabled proposed

5) observed that
apt install iptables-netflow-dkms

fails to install

Setting up iptables-netflow-dkms (2.4-2ubuntu0.4) ...
Loading new ipt-netflow-2.4 DKMS files...
It is likely that 5.13.0-40-generic belongs to a chroot's host
Building for 5.15.0-25-generic
Building initial module for 5.15.0-25-generic
ERROR (dkms apport): kernel package linux-headers-5.15.0-25-generic is not supported
Error! Bad return status for module build on kernel: 5.15.0-25-generic (x86_64)
Consult /var/lib/dkms/ipt-netflow/2.4/build/make.log for more information.

6) enabled proposed once again

7) observed that iptables-netflow-dkms from proposed installs & builds fine

Get:1 http://archive.ubuntu.com/ubuntu focal-proposed/universe amd64 iptables-netflow-dkms amd64 2.4-2ubuntu0.5 [70.5 kB]
Fetched 70.5 kB in 0s (202 kB/s)
(Reading database ... 76722 files and directories currently installed.)
Preparing to unpack .../iptables-netflow-dkms_2.4-2ubuntu0.5_amd64.deb ...

------------------------------
Deleting module version: 2.4
completely from the DKMS tree.
------------------------------
Done.
Unpacking iptables-netflow-dkms (2.4-2ubuntu0.5) over (2.4-2ubuntu0.4) ...
Setting up iptables-netflow-dkms (2.4-2ubuntu0.5) ...
Loading new ipt-netflow-2.4 DKMS files...
It is likely that 5.13.0-40-generic belongs to a chroot's host
Building for 5.15.0-25-generic
Building initial module for 5.15.0-25-generic
Done.

ipt_NETFLOW.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.15.0-25-generic/updates/dkms/

depmod...

DKMS: install completed.