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Sutou Kouhei authored and GitHub committed 00c6521a1dc
GH-15094: [CI][Release][Ruby] Install Bundler by APT (#15095) Because the latest Bundler doesn't work with (EOL-ed) Ruby 2.5 on Ubuntu 18.04. * Closes: #15094 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>