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Recompile 20.04 HWE kernel?

rated 0 times [ 0] [ 0] / answers: 1 / hits: 1066 / 2 Years ago, sat, july 23, 2022, 7:06:56

I am trying to rebuild the 20.04 HWE kernel 5.8 since I need to change one config option. I am trying to guess my way through this since most of the info on rebuilding kernels on Ubuntu seems to be antiquated.

What I do:

apt source linux-image-generic-hwe-20.04

cd linux-meta-hwe-5.8-5.8.0.40.45~20.04.25/

fakeroot debian/rules clean

fakeroot debian/rules binary

This eventually fails:

dh_gencontrol -a -- -Vkernel-version=5.8.0 -Vkernel-abi-version=5.8.0-40 -Vdkms:zfs-modules="zfs-modules (= )," -Vdkms:virtualbox-guest-modules="virtualbox-guest-modules (= 5.8.0-40)," -Vdkms:wireguard-linux-compat-modules="wireguard-modules (= 1.0.0),"

dpkg-gencontrol: warning: can't parse dependency zfs-modules (= )

dpkg-gencontrol: warning: can't parse dependency zfs-modules (= )

dpkg-gencontrol: error: error occurred while parsing Provides field: zfs-modules (= ), virtualbox-guest-modules (= 5.8.0-40), wireguard-modules (= 1.0.0),

dh_gencontrol: error: dpkg-gencontrol -plinux-image-generic-hwe-20.04 -ldebian/changelog -Tdebian/linux-image-generic-hwe-20.04.substvars -Pdebian/linux-image-generic-hwe-20.04 -UMulti-Arch -Vkernel-version=5.8.0 -Vkernel-abi-version=5.8.0-40 "-Vdkms:zfs-modules=zfs-modules (= )," "-Vdkms:virtualbox-guest-modules=virtualbox-guest-modules (= 5.8.0-40)," "-Vdkms:wireguard-linux-compat-modules=wireguard-modules (= 1.0.0)," returned exit code 255

dh_gencontrol: error: Aborting due to earlier error

make: *** [debian/rules:101: binary-arch] Error 2

I don't care about vbox or ZFS so I am happy to disable those somehow, and wireguard is part of 5.8.

I have successfully rebuilt the standard 5.4 Ubuntu kernel, so this is a specific HWE issue.

Thanks for any help!

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answered 2 Years ago antorchestr · Accepted Answer

Clone the repo:

 git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal

Checkout the branch:
```
 cd focal

 git checkout origin/hwe-5.8
```

If you want to disable the nvidia driver, add this patch:

diff --git a/debian/rules b/debian/rules

index 8c3c71a..8742713 100755

--- a/debian/rules

+++ b/debian/rules

@@ -100,6 +100,8 @@ ifeq ($(do_mainline_build),true)

        skipretpoline=true

 endif

 

+do_dkms_nvidia=false

+

 # Disable tools build and packaging if do_tools != true

 ifneq ($(do_tools),true)

        do_linux_tools=

Install the build dependencies:
```
 sudo apt-get build-dep linux
```

Build the kernel:

 fakeroot debian/rules clean

 fakeroot debian/rules binary-headers binary-generic