I had a similar issue after upgrading to 21.04. Package linux-headers-<version> silently failed to build these config files due to lack of packages flex and bison.
sudo apt install flex bison sudo dpkg-reconfigure linux-headers-<version> solved the problem, although the build still fails, but in a later stage. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1916517 Title: ERROR: Kernel configuration is invalid. include/generated/autoconf.h or include/config/auto.conf are missing. Status in linux package in Ubuntu: Confirmed Bug description: I'm unable to build dkms packages since it errors out with: make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/5.10.0-14-generic/build M=/var/lib/dkms/rtl88x2bu/git/build modules make[1]: Entering directory '/usr/src/linux-headers-5.10.0-14-generic' ERROR: Kernel configuration is invalid. include/generated/autoconf.h or include/config/auto.conf are missing. Run 'make oldconfig && make prepare' on kernel src to fix it. make[1]: *** [Makefile:745: include/config/auto.conf] Error 1 make[1]: Leaving directory '/usr/src/linux-headers-5.10.0-14-generic' make: *** [Makefile:2378: modules] Error 2 So I run: make oldconfig && make prepare in /usr/src/linux-headers-5.10.0-14-generic and it errors out with: make[1]: *** No rule to make target 'arch/x86/tools/relocs_32.c', needed by 'arch/x86/tools/relocs_32.o'. Stop. make: *** [arch/x86/Makefile:214: archscripts] Error 2 Thanks for your help! ProblemType: Bug DistroRelease: Ubuntu 21.04 ProcVersionSignature: Ubuntu 5.10.0-14.15-generic 5.10.11 Uname: Linux 5.10.0-14-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu59 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: shemgp 6098 F.... pulseaudio /dev/snd/controlC1: shemgp 6098 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Feb 23 00:59:55 2021 EcryptfsInUse: Yes InstallationDate: Installed on 2015-09-28 (1974 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: LENOVO 34361A0 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.10.0-14-generic root=UUID=da81a856-84d5-4ca7-8c0a-4f20006730bc ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.10.0-14-generic N/A linux-backports-modules-5.10.0-14-generic N/A linux-firmware 1.194 SourcePackage: linux StagingDrivers: ashmem_linux UpgradeStatus: Upgraded to hirsute on 2021-02-16 (6 days ago) dmi.bios.date: 09/25/2019 dmi.bios.release: 2.75 dmi.bios.vendor: LENOVO dmi.bios.version: GCETB5WW (2.75 ) dmi.board.asset.tag: Not Available dmi.board.name: 34361A0 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.ec.firmware.release: 1.15 dmi.modalias: dmi:bvnLENOVO:bvrGCETB5WW(2.75):bd09/25/2019:br2.75:efr1.15:svnLENOVO:pn34361A0:pvrThinkPadX220:rvnLENOVO:rn34361A0:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.family: ThinkPad X220 dmi.product.name: 34361A0 dmi.product.sku: LENOVO_MT_3436 dmi.product.version: ThinkPad X220 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1916517/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
