Do NOT install `ntp` to Ubuntu 20.04.

cookbooks/base/default.rb

@@ -54,17 +54,18 @@ include_recipe './fortune.rb'
 # timezone configurations:
 include_recipe './timezone.rb'
 
-# ntp configurations:
-include_recipe './ntp.rb'
-
 # kernel configurations:
 include_recipe './kernel.rb'
 
 # Install mc command:
 include_recipe './mc.rb'
 
-# unnecessary configurations:
+# recipes for Ubuntu 16.04
 if node['platform_version'].to_f == 16.04
+  # ntp configurations
+  include_recipe './ntp.rb'
+
+  # misc recipe
   include_recipe './unnecessary.rb'
 end
 

cookbooks/base/ntp.rb

@@ -1,7 +1,3 @@
-case run_command('grep VERSION_ID /etc/os-release | awk -F\" \'{print $2}\'').stdout.chomp
-when "18.04"
-  # do nothing
-else
 package 'ntp'
 
 remote_file '/etc/ntp.conf' do
@@ -15,4 +11,3 @@ else
 service 'ntp' do
   action :nothing
 end
-end