I was trying upgrade both nodes of my 8.4 PVEs to 9.x. One completed successfully, but one failed. I can't figure out how to resolve this particular one. Can someone point me in the correct direction?

root@pve1:~# sudo apt install -f
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 78 not upgraded.
5 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up proxmox-kernel-6.8.12-29-pve-signed (6.8.12-29) ...
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 6.8.12-29-pve /boot/vmlinuz-6.8.12-29-pve
dkms: running auto installation service for kernel 6.8.12-29-pve.
Sign command: /lib/modules/6.8.12-29-pve/build/scripts/sign-file
Signing key: /var/lib/dkms/mok.key
Public certificate (MOK): /var/lib/dkms/mok.pub
Error! The /var/lib/dkms/i915-sriov-dkms/6.5.13-3/6.8.12-29-pve/x86_64/dkms.conf for module i915-sriov-dkms includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
This indicates that it should not be built.
Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
dkms: autoinstall for kernel: 6.8.12-29-pve

failed!

run-parts: /etc/kernel/postinst.d/dkms exited with return code 11
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/proxmox-kernel-6.8.12-29-pve-signed.postinst line 20.
dpkg: error processing package proxmox-kernel-6.8.12-29-pve-signed (--configure):
installed proxmox-kernel-6.8.12-29-pve-signed package post-installation script subprocess returned error exit status 2
Setting up proxmox-kernel-7.0.6-2-pve-signed (7.0.6-2) ...
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 7.0.6-2-pve /boot/vmlinuz-7.0.6-2-pve
dkms: running auto installation service for kernel 7.0.6-2-pve.
Sign command: /lib/modules/7.0.6-2-pve/build/scripts/sign-file
Signing key: /var/lib/dkms/mok.key
Public certificate (MOK): /var/lib/dkms/mok.pub
Error! The /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf for module i915-sriov-dkms includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
This indicates that it should not be built.
Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
dkms: autoinstall for kernel: 7.0.6-2-pve failed!
run-parts: /etc/kernel/postinst.d/dkms exited with return code 11
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/proxmox-kernel-7.0.6-2-pve-signed.postinst line 20.
dpkg: error processing package proxmox-kernel-7.0.6-2-pve-signed (--configure):
installed proxmox-kernel-7.0.6-2-pve-signed package post-installation script subprocess returned error exit status 2
dpkg: dependency problems prevent configuration of proxmox-kernel-6.8:
proxmox-kernel-6.8 depends on proxmox-kernel-6.8.12-29-pve-signed | proxmox-kernel-6.8.12-29-pve; however:
Package proxmox-kernel-6.8.12-29-pve-signed is not configured yet.
Package proxmox-kernel-6.8.12-29-pve is not installed.
Package proxmox-kernel-6.8.12-29-pve-signed which provides proxmox-kernel-6.8.12-29-pve is not configured yet.

dpkg: error processing package proxmox-kernel-6.8 (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of proxmox-kernel-7.0:
proxmox-kernel-7.0 depends on proxmox-kernel-7.0.6-2-pve-signed | proxmox-kernel-7.0.6-2-pve; however:
Package proxmox-kernel-7.0.6-2-pve-signed is not configured yet.
Package proxmox-kernel-7.0.6-2-pve is not installed.
Package proxmox-kernel-7.0.6-2-pve-signed which provides proxmox-kernel-7.0.6-2-pve is not configured yet.

dpkg: error processing package proxmox-kernel-7.0 (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of proxmox-default-kernel:
proxmox-default-kernel depends on proxmox-kernel-7.0; however:
Package proxmox-kernel-7.0 is not configured yet.

dpkg: error processing package proxmox-default-kernel (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
proxmox-kernel-6.8.12-29-pve-signed
proxmox-kernel-7.0.6-2-pve-signed
proxmox-kernel-6.8
proxmox-kernel-7.0
proxmox-default-kernel
Removing subscription nag from UI...
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@pve1:~# nano /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf
root@pve1:~# nano /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf
root@pve1:~# cd /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf
-bash: cd: /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf: No such file or directory
root@pve1:~# cd /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64
-bash: cd: /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64: No such file or directory
root@pve1:~#

Error! The /var/lib/dkms/i915-sriov-dkms/6.5.13-3/7.0.6-2-pve/x86_64/dkms.conf for module i915-sriov-dkms includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
You probably need to get a newer driver version (from wherever you manually got this) that is compatible with the new Linux kernel.

EDIT: Lots of threads on this forum about third-party drivers (mostly NVidia but also AMD and others) that happen to be incompatible with newer Linux kernels as the Linux kernel does not provide a stable interface. Maybe consider switching to a (open-source) driver that comes with the Linux kernel? Or maybe the maintainers of that driver can upstream it to the kernel?

Thanks for the suggestion. I'll see if I can either update or remove that driver.

That was it. I removed the drivers and it completed the update. Running on 9.2.3 now. Thank you very much!