Hello, I believe this bug is fixed.
/usr/share/perl5/Sbuild/ChrootSetup.pm shipped with libsbuild-perl 0.65.0-1 has: # Secret keyring needs to be readable by 'sbuild' group. @command = ('chmod', '640', $conf->get('SBUILD_BUILD_DEPENDS_SECRET_KEY')); $host->run_command( { COMMAND => \@command, USER => $conf->get('BUILD_USER'), PRIORITY => 0, DIR => '/'}); return $?; BR Pierre