Proxmox upgrading from 5.4.* -> 6.1-7

Posted 12 February, 2020

It’s the first time I’m upgrading Proxmox’s; There is luckily good documentation on the upgrade path; So this is only a small summary of how I did the upgrade of a few standalone proxmox machines; (big note : this is for non cluster proxmox)

First I upgrade everything to the latest :

apt-get update && apt-get dist-upgrade

Should work flawless :

[email protected]:~# apt-get update
Ign:1 stretch InRelease
Get:2 stretch/updates InRelease [94.3 kB]
Get:3 stretch-updates InRelease [91.0 kB]
Hit:4 stretch Release
Hit:5 stretch InRelease
Fetched 185 kB in 0s (308 kB/s)
Reading package lists... Done
[email protected]:~# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

In case you have kernel updates; its advisable to reboot the machine, so you work from the latest and greatest.

After this use the proxmox upgrade checktool :


This delivered :


TOTAL:    16
PASSED:   13

The only warning is :

WARN: 2 running guest(s) detected - consider migrating or stopping them.

On a different machine some SSH Ciphers where no longer supported; to fix this, remove them; from :


Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc

Then change the repo’s being used from stretch to buster, one can use this handy one liner; unless you have a subscription then you need to also change /etc/apt/sources.list.d/pve-enterprise

sed -i 's/stretch/buster/g' /etc/apt/sources.list

after that update the list :

apt-get update

if you want minimal downtime, you could first download the updates, while the machines are still running; using :

apt dist-upgrade --download-only

make sure all machines are down now (I used the webinterface); then run the upgrade : (and pray & take a coffee)

apt dist-upgrade

Some accept’s are required during the installation; (just enter to accept the defaults) these should not be essential to proxmox;

If everything is going fine; reboot and unleash the Proxmox 6.1*goodies, such as ZFS 0.8.2 🙂

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