我已经搜索了许多解决方案，不幸的是，它们都没有成功。以下是我运行捆绑包安装时得到的：
Installing therubyracer 0.12.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/home/louiecubero/.rbenv/versions/2.2.4/bin/ruby -r ./siteconf20151229-3880-cwrbql.rb extconf.rb
checking for main() in -lpthread... yes
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling constants.cc
make: g++: Command not found
make: *** [constants.o] Error 127
make failed, exit code 2
Gem files will remain installed in /home/louiecubero/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/therubyracer-0.12.2 for inspection.
Results logged to /home/louiecubero/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/extensions/x86_64-linux/2.2.0-static/therubyracer-0.12.2/gem_make.out
我使用的ruby版本是：
ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-linux]
我的rails版本是：rails 4.2.5
它抱怨您还没有安装g++。
我认为您需要首先进行sudo apt-get install g++