--https://jp.ubuntu.com/blog/canonical-releases-ubuntu-25-04-plucky-puffin-jp
-Plucky Puffin Release Notes - Project Discussion / Release - Ubuntu Community Hub
--https://discourse.ubuntu.com/t/plucky-puffin-release-notes/48687
-Ubuntu 25.04 (Plucky Puffin)
--https://releases.ubuntu.com/plucky/
-PluckyUpgrades - Community Help Wiki
--https://help.ubuntu.com/community/PluckyUpgrades
-Ubuntu 25.04 “Plucky Puffin”のリリース | gihyo.jp
--https://gihyo.jp/admin/clip/01/ubuntu-topics/202504/18
-第858回 Ubuntu 25.04の変更点 | gihyo.jp
--https://gihyo.jp/admin/serial/01/ubuntu-recipe/0858
-Cyber Terminal Ambience: Upgrade Ubuntu 24.10 Oracular Oriole to 25.04 Plucky Puffin - YouTube
--https://www.youtube.com/watch?v=d744HCZI--c
-->commands:
-->lsb_release -a
-->cat /etc/apt/sources.list.d/ubuntu.sources
-->sudo apt update
-->sudo apt upgrade
-->sudo apt dist-upgrade
-->sudo apt autoremove
-->sudo apt install update-manager-core
-->cat /etc/update-manager/release-upgrades
-->sudo do-release-upgrade -c
-->sudo iptables -I INPUT -p tcp --dport 1022 -j ACCEPT
-->sudo iptables -L
-->sudo do-release-upgrade
-->lsb_release -a
-->cat /etc/apt/sources.list.d/ubuntu.sources
-->sudo apt update
-Ubuntu
--http://www.nilab.info/wiki/Ubuntu.html