This appears to be fixed in the latest netboot installer published today (2019-02-21 13:49 UTC).
http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/installer-amd64/current/images/netboot/
Our tests on installers before that were seeing the segfaults, but everything seems to be working again using the latest installer.
This appears to be fixed in the latest netboot installer published today (2019-02-21 13:49 UTC).
http:// archive. ubuntu. com/ubuntu/ dists/xenial- updates/ main/installer- amd64/current/ images/ netboot/
Our tests on installers before that were seeing the segfaults, but everything seems to be working again using the latest installer.