Comment 5 for bug 1791578

My workaround solution (could be better):

# Enable dhclient-script
FILE="/etc/dhcp/dhclient.conf"
dpkg-divert --package "isc-dhcp-client" \
  --add "$FILE"
sed -i -e 's|#script.*|script "/sbin/dhclient-script";|g' $FILE

# Disabled resolved hook
FILE="/etc/dhcp/dhclient-enter-hooks.d/resolved"
dpkg-divert --package "isc-dhcp-client" \
  --add "$FILE"
mv $FILE $FILE.distrib
touch $FILE
chattr +i $FILE

# Rewrite parameters
cat >> /etc/dhcp/dhclient-enter-hooks.d/aaaa <<"END"
#!/bin/sh
export new_domain_search="$new_domain_name $new_domain_search"
export new_domain_name=
END
cat >> /etc/dhcp/dhclient-exit-hooks.d/aaaa <<"END"
#!/bin/sh
export new_domain_search="$new_domain_name $new_domain_search"
export new_domain_name=
END