So here is my quick an dirty patch.
--- sbuild-createchroot.orig 2021-12-16 18:59:41.498393428 +0100
+++ sbuild-createchroot 2021-12-16 19:07:30.320705427 +0100
@@ -453,6 +453,7 @@
$sources_list .= "$repo\n";
}
+ $sources_list =~ s/\@/\\\@/;
my $passwd_sbuild = `getent passwd sbuild`;
my $group_sbuild = `getent group sbuild`;
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