https://pve.proxmox.com/wiki/Upgrade_from_8_to_9

apt update
apt dist-upgrade
pveversion

sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
sed -i 's/bookworm/trixie/g' /etc/apt/sources.list.d/pve-enterprise.list

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

rm /etc/apt/sources.list

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

[B]E: Conflicting values set for option Signed-By regarding source http://download.proxmox.com/debian/pve/ trixie: /usr/share/keyrings/proxmox-archive-keyring.gpg !=
E: The list of sources could not be read.[/B]

 pve8to9
= CHECKING VERSION INFORMATION FOR PVE PACKAGES =

Checking for package updates..
PASS: all packages up-to-date

Checking proxmox-ve package version..
[B]Conflicting values set for option Signed-By regarding source http://download.proxmox.com/debian/pve/ trixie: /usr/share/keyrings/proxmox-archive-keyring.gpg !=
The list of sources could not be read.
FAIL: unable to retrieve package version information- unable to initialize AptPkg::Cache

FAIL: proxmox-ve package not found![/B]

= CHECKING CLUSTER HEALTH/SETTINGS =

SKIP: standalone node.

= CHECKING HYPER-CONVERGED CEPH STATUS =

SKIP: no hyper-converged ceph setup detected!

= CHECKING CONFIGURED STORAGES =

PASS: storage 'local' enabled and active.
PASS: storage 'local-lvm' enabled and active.
INFO: Checking storage content type configuration..
PASS: no storage content problems found
PASS: no storage re-uses a directory for multiple content types.
INFO: Check for usage of native GlusterFS storage plugin...
PASS: No GlusterFS storage found.
INFO: Checking whether all external RBD storages have the 'keyring' option configured
SKIP: No RBD storage configured.

= VIRTUAL GUEST CHECKS =

INFO: Checking for running guests..
WARN: 2 running guest(s) detected - consider migrating or stopping them.
INFO: Checking if LXCFS is running with FUSE3 library, if already upgraded..
SKIP: not yet upgraded, no need to check the FUSE library version LXCFS uses
INFO: Checking for VirtIO devices that would change their MTU...
PASS: All guest config descriptions fit in the new limit of 8 KiB
INFO: Checking container configs for deprecated lxc.cgroup entries
PASS: No legacy 'lxc.cgroup' keys found.
INFO: Checking VM configurations for outdated machine versions
PASS: All VM machine versions are recent enough

= MISCELLANEOUS CHECKS =

INFO: Checking common daemon services..
PASS: systemd unit 'pveproxy.service' is in state 'active'
PASS: systemd unit 'pvedaemon.service' is in state 'active'
PASS: systemd unit 'pvescheduler.service' is in state 'active'
PASS: systemd unit 'pvestatd.service' is in state 'active'
INFO: Checking for supported & active NTP service..
PASS: Detected active time synchronisation unit 'chrony.service'
INFO: Checking if the local node's hostname 'svProx1' is resolvable..
INFO: Checking if resolved IP is configured on local node..
PASS: Resolved node IP '172.16.1.16' configured and active on single interface.
INFO: Check node certificate's RSA key size
PASS: Certificate 'pve-root-ca.pem' passed Debian Busters (and newer) security level for TLS connections (4096 >= 2048 RSA)
PASS: Certificate 'pve-ssl.pem' passed Debian Busters (and newer) security level for TLS connections (2048 >= 2048 RSA)
INFO: Checking backup retention settings..
PASS: no backup retention problems found.
INFO: checking CIFS credential location..
PASS: no CIFS credentials at outdated location found.
INFO: Checking permission system changes..
INFO: Checking custom role IDs
PASS: no custom roles defined
INFO: Checking node and guest description/note length..
PASS: All node config descriptions fit in the new limit of 64 KiB
INFO: Checking if the suite for the Debian security repository is correct..
PASS: found no suite mismatch
INFO: Checking for existence of NVIDIA vGPU Manager..
PASS: No NVIDIA vGPU Service found.
INFO: Checking bootloader configuration...
SKIP: System booted in legacy-mode - no need for additional packages
INFO: Check for dkms modules...
SKIP: could not get dkms status
INFO: Check for legacy 'filter' or 'group' sections in /etc/pve/notifications.cfg...
PASS: No legacy 'filter' or 'group' sections found!
INFO: Check for legacy 'notification-policy' or 'notification-target' options in /etc/pve/jobs.cfg...
PASS: No legacy 'notification-policy' or 'notification-target' options found!
INFO: Check for LVM autoactivation settings on LVM and LVM-thin storages...
NOTICE: storage 'local-lvm' has guest volumes with autoactivation enabled
NOTICE: Starting with PVE 9, autoactivation will be disabled for new LVM/LVM-thin guest volumes. This system has some volumes that still have autoactivation enabled. All volumes with autoactivations reside on local storage, where this normally does not cause any issues.
You can run the following command to disable autoactivation for existing LVM/LVM-thin guest volumes:

        /usr/share/pve-manager/migrations/pve-lvm-disable-autoactivation

INFO: Checking lvm config for thin_check_options...
PASS: Check for correct thin_check_options passed
INFO: Check space requirements for RRD migration...
PASS: Enough free disk space for increased RRD metric granularity requirements, which is roughly 6.31 MiB.
INFO: Checking for IPAM DB files that have not yet been migrated.
PASS: No legacy IPAM DB found.
PASS: No legacy MAC DB found.
INFO: Checking if the legacy sysctl file '/etc/sysctl.conf' needs to be migrated to new '/etc/sysctl.d/' path.
PASS: Legacy file '/etc/sysctl.conf' exists but does not contain any settings.
INFO: Checking if matching CPU microcode package is installed.
[B]Conflicting values set for option Signed-By regarding source http://download.proxmox.com/debian/pve/ trixie: /usr/share/keyrings/proxmox-archive-keyring.gpg !=
The list of sources could not be read.
FAIL: unable to retrieve package version information- unable to initialize AptPkg::Cache[/B]

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
SKIP: NOTE: Expensive checks, like CT cgroupv2 compat, not performed without '--full' parameter

= SUMMARY =

TOTAL:    44
PASSED:   30
SKIPPED:  7
WARNINGS: 2
FAILURES: 3

ATTENTION: Please check the output for detailed information!
Try to solve the problems one at a time and then run this checklist tool again.

bash -c "$(wget -qLO - https://github.com/tteck/Proxmox/raw/main/misc/microcode.sh)"
# Install 'deb13u1_amd64.deb' Microcode