ubuntu-knowledge-patch
Ubuntu 25.10+ Knowledge Patch
Claude's baseline knowledge covers Ubuntu through 24.04 LTS Noble Numbat. This skill provides changes from 25.10 Questing Quokka (2025-10-09) onwards.
Breaking Changes Quick Reference
| What Changed | Old | New (25.10+) |
|---|---|---|
| sudo | GNU sudo |
sudo-rs (Rust); originals renamed .ws |
| Core utilities | GNU coreutils | rust-coreutils v0.2.2; GNU as fallback |
| APT solver | Legacy solver | New solver default; apt why / apt why-not |
| wget on server | Pre-installed | Removed; use wcurl $URL instead |
| Time daemon | systemd-timesyncd | Chrony with NTS on port 4460/tcp |
| OpenSSH | 9.x | 10.0 — post-quantum key exchange, DSA removed |
| OpenSSL | 3.x | 3.5 — ML-KEM, ML-DSA, SLH-DSA; QUIC support |
| Valkey/Redis compat | valkey-redis-compat |
Removed — swap to Valkey before upgrading |
| Desktop session | X.org + Wayland | Wayland-only; X.org session removed |
| Terminal multiplexers | byobu in main, screen in server seed |
byobu demoted to universe, screen removed |
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