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Sutou Kouhei authored and GitHub committed a70ac2d13ed
GH-45476: [Packaging][Linux] Drop support for Ubuntu 20.04 (#45477) ### Rationale for this change Ubuntu 20.04 will reach EOL on 2025-05. ### What changes are included in this PR? Remove Ubuntu 20.04 related codes. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * GitHub Issue: #45476 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>