I got an error: Your Ruby version is 2.3.3, but your Gemfile specified 2.5.2 with running bundle install.
Besides, ruby -v shows ruby 2.5.2p104 (2018-10-18 revision 65133) [x86_64-linux].
OS: Debian 9
Problem with bundler was solved with: Your Ruby version is 2.0.0, but your Gemfile specified 2.1.0
But now there is the same error with rails s