```ruby
#
# Cookbook Name:: ubuntu
# Recipe:: default
#
# Copyright 2008-2009, Opscode, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

include_recipe "apt"

template "/etc/apt/sources.list" do
  mode 00644
  variables :code_name => node['lsb']['codename']
  notifies :run, resources(:execute => "apt-get update"), :immediately
  source "sources.list.erb"
end
```

Use the new format for notifies
user
```ruby
#
# Cookbook Name:: ubuntu
# Recipe:: default
#
# Copyright 2008-2009, Opscode, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

include_recipe "apt"

template "/etc/apt/sources.list" do
  mode 00644
  variables :code_name => node['lsb']['codename']
  notifies :run, "execute[apt-get update]", :immediately
  source "sources.list.erb"
end```
assistant