Unable to install Ruby gem selenium-webdriver on Ubuntu 19.04

Question

I'm trying to install the gem selenium-webdriver on Ubuntu 19.04 but I keep getting this error:

sudo gem install selenium-webdriver  

Building native extensions. This could take a while... ERROR: Error installing selenium-webdriver: ERROR: Failed to build gem native extension.

current directory: /var/lib/gems/2.5.0/gems/childprocess-1.0.1/ext /usr/bin/ruby2.5 mkrf_conf.rb

current directory: /var/lib/gems/2.5.0/gems/childprocess-1.0.1/ext /usr/bin/ruby2.5 -rrubygems /usr/share/rubygems-integration/all/gems/rake-12.3.1/exe/rake RUBYARCHDIR\=/var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/childprocess-1.0.1 RUBYLIBDIR\=/var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/childprocess-1.0.1 /usr/bin/ruby2.5: No such file or directory -- /usr/share/rubygems-integration/all/gems/rake-12.3.1/exe/rake (LoadError)

rake failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.5.0/gems/childprocess-1.0.1 for inspection. Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/childprocess-1.0.1/gem_make.out

I have tried

sudo gem update --system
sudo apt install ruby-dev
sudo apt install build-essential
sudo apt install gcc
sudo apt install make


ruby -v ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-linux-gnu]
gem -v 3.0.3

Answer 1

I had to do this

sudo gem pristine rake

Restoring gems to pristine condition... Cached gem for rake-12.3.1 not found, attempting to fetch... Fetching rake-12.3.1.gem Restored rake-12.3.1