- Replace Docker convenience script with manual repository setup in lib/system.sh
- Add proper Ubuntu codename detection for Linux Mint using UBUNTU_CODENAME from /etc/os-release
- Include fallback version mapping for older Linux Mint versions (22.x->noble, 21.x->jammy, 20.x->focal)
- Add debug output to track codename detection
- Resolves issue where get.docker.com script was using incorrect "xia" codename instead of "noble"
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Co-Authored-By: Claude <noreply@anthropic.com>