The compat 11 is discouraged for new packages as it suffers from feature interaction between dh_installinit and dh_installsystemd causing services to not run correctly in some cases. Please consider using compatibility mode 10 or 12 instead. More details about the issue are available in Debian#887904 and <https://lists.debian.org/debian-release/2019/04/msg01442.html>."
It's hard for me to tell what compat level a package build used in launchpad, but the man page for debhelper [1] discourages compat level 11:
https:/ /manpages. debian. org/testing/ debhelper/ debhelper. 7.en.html
"This mode is discouraged.
The compat 11 is discouraged for new packages as it suffers from feature interaction between dh_installinit and dh_installsystemd causing services to not run correctly in some cases. Please consider using compatibility mode 10 or 12 instead. More details about the issue are available in Debian#887904 and <https:/ /lists. debian. org/debian- release/ 2019/04/ msg01442. html>."