Proxmox を 8 系から 9 系へアップグレード

FAIL: systemd-boot meta-package installed. This will cause problems on upgrades of other boot-related packages. Remove 'systemd-boot' See https://pve.proxmox.com/wiki/Upgrade_from_8_to_9#sd-boot-warning for more information.

WARN: The matching CPU microcode package 'intel-microcode' could not be found! Consider installing it to receive the latest security and bug fixes for your CPU.
Ensure you enable the 'non-free-firmware' component in the apt sources and run:
apt install intel-microcode

現在のリポジトリ設定を確認
cat /etc/apt/sources.list
deb http://ftp.jp.debian.org/debian bookworm main contrib

deb http://ftp.jp.debian.org/debian bookworm-updates main contrib

# security updates
deb http://security.debian.org bookworm-security main contrib

deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

コピーしてバックアップ
cp /etc/apt/sources.list /etc/apt/sources.list.backup20260505

以下に丸っと上書き
cat > /etc/apt/sources.list << EOF
deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
deb http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware
EOF

上書きされたか確認
cat sources.list
deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
deb http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware

リポジトリの内容を更新
sudo apt update

intel-microcodeが利用できるようになったか確認
sudo apt policy intel-microcode

インストールする
sudo apt install intel-microcode

WARN: Removable bootloader found at '/boot/efi/EFI/BOOT/BOOTX64.efi', but GRUB packages not set up to update it!
Run the following command:
echo 'grub-efi-amd64 grub2/force_efi_extra_removable boolean true' | debconf-set-selections -v -u
Then reinstall GRUB with 'apt install --reinstall grub-efi-amd64'

書かれている内容を実行する
echo 'grub-efi-amd64 grub2/force_efi_extra_removable boolean true' | debconf-set-selections -v -u

再インストール
sudo apt install --reinstall grub-efi-amd64

リポジトリをtrixieにするので、公式にあるものを実施
sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
sed -i 's/bookworm/trixie/g' /etc/apt/sources.list.d/pve-enterprise.list

うちは、無料版を利用しているので、中身を書き換え
cat > /etc/apt/sources.list.d/pve-enterprise.sources << EOF
Types: deb
URIs: https://enterprise.proxmox.com/debian/pve
Suites: trixie
Components: pve-enterprise
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
EOF

cat > /etc/apt/sources.list.d/proxmox.sources << EOF
Types: deb
URIs: http://download.proxmox.com/debian/pve
Suites: trixie
Components: pve-no-subscription
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
EOF

Cephも設定する
cat > /etc/apt/sources.list.d/ceph.sources << EOF
Types: deb
URIs: https://enterprise.proxmox.com/debian/ceph-squid
Suites: trixie
Components: enterprise
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
EOF

cat > /etc/apt/sources.list.d/ceph.sources << EOF
Types: deb
URIs: http://download.proxmox.com/debian/ceph-squid
Suites: trixie
Components: no-subscription
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
EOF

アップデート実行
sudo apt update

アップグレード実行
sudo apt dist-upgrade

途中でうちの環境では、以下の 3 つを聞かれた（環境によるよう）
*** issue (Y/I/N/O/D/Z) [default=N] ? n　⇒　公式サイトでNoでいいと
*** lvm.conf (Y/I/N/O/D/Z) [default=N] ? y　⇒　公式サイトでYesがいいと
*** pve-enterprise.sources (Y/I/N/O/D/Z) [default=N] ? n　⇒　自分は個人環境なのでNoにした

終わったら再起動
sudo reboot