There are many lintian issues in the isc-kea package. At least the most important ones should be fixed:
W: isc-kea source: ancient-standards-version 3.9.7 (released 2016-02-01) (current is 4.5.0)
W: kea-common: binary-without-manpage usr/bin/kea-msg-compiler
W: isc-kea source: debian-rules-uses-unnecessary-dh-argument dh ... --parallel (line 16)
W: kea-doc: embedded-javascript-library usr/share/doc/kea/html/_static/jquery.js please use libjs-jquery
W: kea-doc: embedded-javascript-library usr/share/doc/kea/html/_static/underscore.js please use libjs-underscore
W: isc-kea source: orig-tarball-missing-upstream-signature isc-kea_1.6.1.orig.tar.gz
W: kea-dev: package-name-defined-in-config-h usr/include/kea/config.h
W: kea-common: package-name-doesnt-match-sonames libkea-asiodns0 libkea-asiolink7 libkea-cc8 libkea-cfgclient7 libkea-cryptolink4 libkea-database3 libkea-dhcp++13 libkea-dhcp-ddns1 libkea-dhcpsrv16 libkea-dns++3 libkea-eval11 libkea-exceptions0 libkea-hooks7 libkea-http6 libkea-log4 libkea-mysql1 libkea-pgsql0 libkea-process4 libkea-stats3 libkea-threads2 libkea-util-io0 libkea-util7
W: kea-admin: script-not-executable usr/share/kea/scripts/admin-utils.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/cql/upgrade_1.0_to_2.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/cql/upgrade_2.0_to_3.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/cql/upgrade_3.0_to_4.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/cql/wipe_data.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_1.0_to_2.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_2.0_to_3.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_3.0_to_4.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_4.0_to_4.1.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_4.1_to_5.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_5.0_to_5.1.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_5.1_to_5.2.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_5.2_to_6.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_6.0_to_7.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_7.0_to_8.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_8.0_to_8.1.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/upgrade_8.1_to_8.2.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/mysql/wipe_data.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_1.0_to_2.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_2.0_to_3.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_3.0_to_3.1.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_3.1_to_3.2.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_3.2_to_3.3.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_3.3_to_4.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_4.0_to_5.0.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/upgrade_5.0_to_5.1.sh
W: kea-admin: script-not-executable usr/share/kea/scripts/pgsql/wipe_data.sh
W: kea-ctrl-agent: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/kea-ctrl-agent.service kea-dhcp4-server.service
W: kea-ctrl-agent: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/kea-ctrl-agent.service kea-dhcp6-server.service
W: kea-dhcp-ddns-server: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/kea-dhcp-ddns-server.service kea-dhcp4-server.service
W: kea-dhcp-ddns-server: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/kea-dhcp-ddns-server.service kea-dhcp6-server.service
I: kea-common: extended-description-is-probably-too-short
I: kea-ctrl-agent: extended-description-is-probably-too-short
I: kea-doc: extended-description-is-probably-too-short
I: python3-kea-connector: extended-description-is-probably-too-short
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Bold.ttf.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Bold.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-BoldItalic.ttf.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-BoldItalic.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Italic.ttf.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Italic.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Regular.ttf.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/Lato-Regular.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/RobotoSlab-Bold.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/RobotoSlab-Regular.woff2.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.eot.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.ttf.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.woff.gz
I: kea-doc: font-in-non-font-package usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Bold.ttf.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Bold.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-BoldItalic.ttf.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-BoldItalic.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Italic.ttf.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Italic.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Regular.ttf.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/Lato-Regular.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/RobotoSlab-Bold.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/RobotoSlab-Regular.woff2.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.eot.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.ttf.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.woff.gz
I: kea-doc: font-outside-font-dir usr/share/doc/kea/html/_static/fonts/fontawesome-webfont.woff2.gz
I: kea-admin: hardening-no-fortify-functions usr/sbin/perfdhcp
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_ha.so
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_lease_cmds.so
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_mysql_cb.so
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_stat_cmds.so
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-asiodns.so.0.0.2
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-cfgclient.so.7.0.1
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-database.so.3.1.0
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-dhcp_ddns.so.1.0.5
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-dhcpsrv.so.16.0.1
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-hooks.so.7.0.3
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-mysql.so.1.0.2
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-pgsql.so.0.0.2
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-process.so.4.2.0
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-util-io.so.0.0.1
I: kea-common: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/libkea-util.so.7.0.0
I: kea-common: hardening-no-fortify-functions usr/sbin/kea-lfc
I: kea-dhcp-ddns-server: init.d-script-does-not-provide-itself etc/init.d/kea-dhcp-ddns-server
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-asiodns.so.0.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-asiolink.so.7.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-cc.so.8.1.1
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-cfgclient.so.7.0.1
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-cryptolink.so.4.0.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-database.so.3.1.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-dhcp++.so.13.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-dhcp_ddns.so.1.0.5
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-dhcpsrv.so.16.0.1
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-dns++.so.3.0.1
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-eval.so.11.0.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-exceptions.so.0.2.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-hooks.so.7.0.3
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-http.so.6.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-log.so.4.0.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-mysql.so.1.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-pgsql.so.0.0.2
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-process.so.4.2.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-stats.so.3.1.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-threads.so.2.0.0
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-util-io.so.0.0.1
I: kea-common: no-symbols-control-file usr/lib/x86_64-linux-gnu/libkea-util.so.7.0.0
I: isc-kea source: ored-build-depends-on-obsolete-package build-depends: libmysqlclient-dev => default-libmysqlclient-dev
I: kea-doc: possible-documentation-but-no-doc-base-registration
I: isc-kea source: public-upstream-key-not-minimal upstream/signing-key.asc has 2 extra signature(s) for keyid F1B11BF05CF02E57
I: isc-kea source: quilt-patch-missing-description 0006-fix-logger-path.patch
I: isc-kea source: quilt-patch-missing-description 0007-keyctrl-colored-ddns-status.patch
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_mysql_cb.so errror error
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/libkea-database.so.3.1.0 uknown unknown
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/libkea-dhcpsrv.so.16.0.1 errror error
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/libkea-dhcpsrv.so.16.0.1 explict explicit
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/libkea-http.so.6.0.2 lengH length
I: kea-common: spelling-error-in-binary usr/lib/x86_64-linux-gnu/libkea-pgsql.so.0.0.2 errror error
I: kea-dhcp-ddns-server: spelling-error-in-binary usr/sbin/kea-dhcp-ddns algorith algorithm
I: isc-kea source: testsuite-autopkgtest-missing
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/benchmarks/ (paragraph at line 13)
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/cql_connection.cc (paragraph at line 13)
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/cql_connection.h (paragraph at line 13)
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/cql_exchange.cc (paragraph at line 13)
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/cql_exchange.h (paragraph at line 13)
I: isc-kea source: wildcard-matches-nothing-in-dep5-copyright src/lib/dhcpsrv/sql_common.h (paragraph at line 13)
P: isc-kea source: file-contains-trailing-whitespace debian/changelog (line 63)
P: isc-kea source: package-uses-old-debhelper-compat-version 11
P: isc-kea source: rules-requires-root-missing
I addressed some of those lintian tags in 1.8.0-0ubuntu1 [1], without realizing there was this bug to close or at least update. My plan is to make the package even more lintian clean with the 2.0.1 merge from upstream.
[1] https:/