Package: src:debhelper Version: 11.1.5 Since dh_update_autotools_config is recommended to be used, and dh_autotools-dev_restoreconfig should be used anymore, and dh_clean will work with dh_update_autotools_config,
while dh_clean cannot config.{guess,sub} in a subdir, I meet this problem when I try to add the dh_update_autotools_config to kexec-tools_2.0.16-1 -- YunQiang Su