基于Ubuntu23.04编译最新版Linux内核（6.8.9），并解决编译过程中的相关问题。

根据出现的问题，需要安装一下软件：sudo apt install flex bc libelf-dev，并禁用系统相关证书：

scripts/config --disable SYSTEM_TRUSTED_KEYS
scripts/config --disable SYSTEM_REVOCATION_KEYS

源码下载：

中科大镜像站：Index of /kernel.org/ (ustc.edu.cn)

下载内核源码：wget https://mirrors.ustc.edu.cn/kernel.org/linux/kernel/v6.x/linux-6.8.9.tar.gz

问题

问题1：make menuconfig时提示flex: not found

错误日志：

/bin/sh: 1: flex: not found
make[2]: *** [scripts/Makefile.host:9: scripts/kconfig/lexer.lex.c] Error 127
make[1]: *** [/home/blduan/opensrcs/linux-6.8.9/Makefile:689: menuconfig] Error 2
make: *** [Makefile:240: __sub-make] Error 2

解决方案：

sudo apt install flex

问题2：make时提示bc: not found

错误日志：

/bin/sh: 1: bc: not found
make[2]: *** [Kbuild:24: include/generated/timeconst.h] Error 127
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/home/blduan/opensrcs/linux-6.8.9/Makefile:1199: prepare0] Error 2
make: *** [Makefile:240: __sub-make] Error 2

解决方案： sudo apt install bc

问题3：<stdin>:1:10: fatal error: libelf.h: No such file or directory

错误日志：

mkdir -p /home/blduan/opensrcs/linux-6.8.9/tools/objtool && make O=/home/blduan/opensrcs/linux-6.8.9 subdir=tools/objtool --no-print-directory -C objtool
<stdin>:1:10: fatal error: libelf.h: No such file or directory
compilation terminated.
  UPD     include/generated/timeconst.h
  UPD     include/generated/bounds.h
  CC      arch/x86/kernel/asm-offsets.s
  INSTALL libsubcmd_headers
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/check.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/weak.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/arch/x86/special.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/special.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/elf.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/arch/x86/decode.o
  CC      /home/blduan/opensrcs/linux-6.8.9/tools/objtool/builtin-check.o
In file included from /home/blduan/opensrcs/linux-6.8.9/tools/objtool/include/objtool/objtool.h:13,
                 from /home/blduan/opensrcs/linux-6.8.9/tools/objtool/include/objtool/arch.h:11,
                 from check.c:13:
/home/blduan/opensrcs/linux-6.8.9/tools/objtool/include/objtool/elf.h:10:10: fatal error: gelf.h: No such file or directory
   10 | #include <gelf.h>
      |          ^~~~~~~~
compilation terminated.

解决方案： sudo apt install libelf-dev

问题4：*** No rule to make target 'debian/canonical-certs.pem', needed by 'certs/x509_certificate_list'.

错误日志：

  CALL    scripts/checksyscalls.sh
  DESCEND objtool
  INSTALL libsubcmd_headers
make[3]: *** No rule to make target 'debian/canonical-certs.pem', needed by 'certs/x509_certificate_list'.  Stop.
make[2]: *** [scripts/Makefile.build:481: certs] Error 2
make[1]: *** [/home/blduan/opensrcs/linux-6.8.9/Makefile:1921: .] Error 2
make: *** [Makefile:240: __sub-make] Error 2

解决方案：

scripts/config --disable SYSTEM_TRUSTED_KEYS
scripts/config --disable SYSTEM_REVOCATION_KEYS