ubuntu_performance_lkp on Bionic failed with cannot load such file -- active_support/core_ext/enumerable (LoadError)

[Po-Hsu Lin]

This is not a regression, as it can be seen on previous cycle as well.

All tests failed with:
 Running 'lkp split jobs/linpack.yaml || true'
 /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- active_support/core_ext/enumerable (LoadError)
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /home/ubuntu/autotest/client/tmp/ubuntu_performance_lkp/src/lkp-tests/lib/array_ext.rb:3:in `'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /home/ubuntu/autotest/client/tmp/ubuntu_performance_lkp/src/lkp-tests/lib/common.rb:9:in `'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /home/ubuntu/autotest/client/tmp/ubuntu_performance_lkp/src/lkp-tests/lib/job.rb:6:in `'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
     from /home/ubuntu/autotest/client/tmp/ubuntu_performance_lkp/src/lkp-tests/sbin/split-job:5:in `

Looks like there is a version requirement of ruby:
 Processing triggers for libc-bin (2.27-3ubuntu1.6) ...
 Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
 Processing triggers for install-info (6.5.0.dfsg.1-2) ...
 ERROR: Error installing bundler:
     The last version of bundler (>= 0) to support your Ruby & RubyGems was 2.3.26. Try installing it with `gem install bundler -v 2.3.26`
     bundler requires Ruby version >= 2.6.0. The current ruby version is 2.5.0.
 /home/ubuntu/autotest/client/tmp/ubuntu_performance_lkp/src/lkp-tests/lkp-exec/install: line 290: bundle: command not found

[Po-Hsu Lin (cypressyew)]

Affecting Focal 5.4.0-186.206