the new bind9 packages from debian dropped the lightweight resolver (lwres) in version 1:9.11.2+dfsg-1:
* Remove lwresd as it has been deprecated by upstream anyway
Upstream dropped it in bind 9.12.x, but it still exists in the 9.11 code base:
- The lightweight resolver daemon and library (lwresd and liblwres) have been removed. [RT #45186]
I checked ubuntu bionic and the only thing depending on the lwresd package is libnss-lwres, and libnss-lwres is not required by anything else.
Both lwresd and libnss-lwres are in universe.
rmadison shows libnss-lwres has been at verison 0.93 since precise at least. It seems to come from here nowadays: ftp://sources.
redhat.com/pub/glibc/old- (that directory path is a hint). releases/
It's very likely we will follow Debian on this, but I wanted to reach out first to see if there are any objections, heavy users of this resolver, etc. I don't think we need yet another resolver, but better check.