The original bug was fixed in helvum but there's still this:
dpkg-gencontrol: warning: Static-Built-Using field of package helvum: substitution variable ${cargo:Static-Built-Using} used, but is not defined
https://bugs.launchpad.net/ubuntu/+source/helvum/0.5.1+20240328-1
This is also affecting https://launchpad.net/ubuntu/+source/railway-gtk/2.4.0-3
The original bug was fixed in helvum but there's still this:
dpkg-gencontrol: warning: Static-Built-Using field of package helvum: substitution variable ${cargo: Static- Built-Using} used, but is not defined
https:/ /bugs.launchpad .net/ubuntu/ +source/ helvum/ 0.5.1+20240328- 1
This is also affecting https:/ /launchpad. net/ubuntu/ +source/ railway- gtk/2.4. 0-3