diff --git a/cookbooks/base/default.rb b/cookbooks/base/default.rb
index a20739c..8e776ee 100644
--- a/cookbooks/base/default.rb
+++ b/cookbooks/base/default.rb
@@ -66,15 +66,6 @@ include_recipe './lsyncd.rb'
 # Install starship command:
 include_recipe './starship.rb'
 
-# 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
-
 # recipes for Ubuntu 20.04
 if node['platform_version'].to_f == 20.04
   remote_file '/etc/multipath.conf' do
diff --git a/cookbooks/base/files/etc/ntp.conf b/cookbooks/base/files/etc/ntp.conf
deleted file mode 100644
index cd75b19..0000000
--- a/cookbooks/base/files/etc/ntp.conf
+++ /dev/null
@@ -1,66 +0,0 @@
-# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
-
-driftfile /var/lib/ntp/ntp.drift
-
-# Enable this if you want statistics to be logged.
-#statsdir /var/log/ntpstats/
-
-statistics loopstats peerstats clockstats
-filegen loopstats file loopstats type day enable
-filegen peerstats file peerstats type day enable
-filegen clockstats file clockstats type day enable
-
-# Specify one or more NTP servers.
-
-# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
-# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
-# more information.
-pool 0.ubuntu.pool.ntp.org iburst
-pool 1.ubuntu.pool.ntp.org iburst
-pool 2.ubuntu.pool.ntp.org iburst
-pool 3.ubuntu.pool.ntp.org iburst
-
-# Use Ubuntu's ntp server as a fallback.
-pool ntp.ubuntu.com
-
-# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
-# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
-# might also be helpful.
-#
-# Note that "restrict" applies to both servers and clients, so a configuration
-# that might be intended to block requests from certain clients could also end
-# up blocking replies from your own upstream servers.
-
-# By default, exchange time with everybody, but don't allow configuration.
-restrict -4 default kod notrap nomodify nopeer noquery limited
-restrict -6 default kod notrap nomodify nopeer noquery limited
-
-# Local users may interrogate the ntp server more closely.
-restrict 127.0.0.1
-restrict ::1
-
-# Needed for adding pool entries
-restrict source notrap nomodify noquery
-
-# Clients from this (example!) subnet have unlimited access, but only if
-# cryptographically authenticated.
-#restrict 192.168.123.0 mask 255.255.255.0 notrust
-
-
-# If you want to provide time to your local subnet, change the next line.
-# (Again, the address is an example only.)
-#broadcast 192.168.123.255
-
-# If you want to listen to time broadcasts on your local subnet, de-comment the
-# next lines.  Please do this only if you trust everybody on the network!
-#disable auth
-#broadcastclient
-
-#Changes recquired to use pps synchonisation as explained in documentation:
-#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918
-
-#server 127.127.8.1 mode 135 prefer    # Meinberg GPS167 with PPS
-#fudge 127.127.8.1 time1 0.0042        # relative to PPS for my hardware
-
-#server 127.127.22.1                   # ATOM(PPS)
-#fudge 127.127.22.1 flag3 1            # enable PPS API
diff --git a/cookbooks/base/ntp.rb b/cookbooks/base/ntp.rb
deleted file mode 100644
index be36310..0000000
--- a/cookbooks/base/ntp.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-package 'ntp'
-
-remote_file '/etc/ntp.conf' do
-  owner 'root'
-  group 'root'
-  mode '644'
-
-  notifies :restart, 'service[ntp]'
-end
-
-service 'ntp' do
-  action :nothing
-end
diff --git a/cookbooks/base/unnecessary.rb b/cookbooks/base/unnecessary.rb
deleted file mode 100644
index 2132304..0000000
--- a/cookbooks/base/unnecessary.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-%w( apparmor iscsid lxc lxcfs lxd-containers lxd open-iscsi ).each do |s|
-  service s do
-    action :disable
-  end
-end