エラー
Ignoring nokogiri-1.8.4 because its extensions are not built. Try: gem pristine nokogiri --version 1.8.4 .....
Your Ruby version is 2.4.0, but your Gemfile specified 2.5.1
対応
$ rvm get stable
$ gem update bundler
$ bundle install --without production
source:
https://stackoverflow.com/questions/30726848/why-do-i-keep-getting-these-errors-after-running-gem-pristine-all
https://stackoverflow.com/questions/23039528/your-ruby-version-is-2-0-0-but-your-gemfile-specified-2-1-0

エラー
config/boot.rb:4:in `require': cannot load such file -- bootsnap/setup (LoadError)

対応
$ bundle update bootsnap
source:
https://github.com/Shopify/bootsnap/issues/73

$ echo 'gem "bootsnap", require: false' >> Gemfile
$ bundle install
source:
https://github.com/Shopify/bootsnap/issues/134

エラー
Your bundle is locked to parser (2.5.0.4), but that version could not be found in any of the sources listed in your Gemfile.

対応
$ bundle update parser --patch

source:
https://stackoverflow.com/questions/49499606/error-while-running-bundle-install-bundle-is-locked-to-a-parser

エラー
rake aborted! SystemStackError: stack level too deep

対応
1 Gemfile書き換え
$ gem 'rails', github: 'rails/rails', branch: '4-2-stable'

2 bundle install
$ gem update --system

エラー
error occurred while installing json (1.8.3)
Make sure that gem install json -v '1.8.3' succeeds before bundling

対応
$ bundle update json
source:
https://stackoverflow.com/questions/21095098/why-wont-bundler-install-json-gem

$ gem install json -v1.8.3
source:
https://stackoverflow.com/questions/43738346/an-error-occurred-while-installing-json-1-8-2-and-bundler-cannot-continue

$ bundle update

エラー
rails aborted! StandardError: An error has occurred, this and all later migrations canceled: Directly inheriting from ActiveRecord::Migration is not supported. Please specify the Rails release the migration was written for:

対応
db/migrate/_create_friendly_id_slugs.rbに追記
class CreateFriendlyIdSlugs < ActiveRecord::Migration[5.1]
Source:
https://github.com/norman/friendly_id/issues/797