Seems you are trying to PXE boot which is failing. You might need to modify the boot order.
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Ahhh, that would be it.
It nearly works with Version 9 - The Proxmox bit gets repository’s wrong, but its no Biggy to fix
Video of the complete process - https://youtu.be/fkievT0ciIk
Guys, the Proxmox helper scripts make it really easy and do work:
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Does anyone know where I can find a good tutorial on upgrading Proxmox 8 to Proxmox 9? Apparantly support for 8 will end soon.
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I just clicked the update in the PVE section proxmox? I didn't even think about it? Started on v7.0 now on v 9.2.3 and have only ever clicked the update section to do the updates. Never needed a guide.
Do you have subscription by any chance? I also couldn't find how to upgrade from UI. Then i found a guide somewhere (can't say where anymore) to upgrade from ssh and all went well, proxmox ran on V9. Until i rebooted... then proxmox didn't start anymore. So i have to do a fresh new v9 install. Ok, i admit, i guess i missed a step somewhere in the middle...but still, this should be way easier than typing a thousand of linux lines in shell one by one manually (like it's written on above guide).
I have used pveXtoX, as instructed in Continuously use the pve8to9 checklist script multiple times with success (started with Proxmox v5.x).
Now I'm still on v8.4.19 but since I want to replace disks, I will start from scratch.
I'm doing some tests to see how it goes to move my virtual machines temporarily to another system so downtime is minimal.
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I just googled the question and it told me this which saved me writing it
Option 1: Via the Web GUI (Recommended for minor updates)
- Log in to your Proxmox Web Interface.
- In the left-hand menu, expand your Datacenter and select your specific Node.
- Click on the Updates tab.
- Click Refresh to fetch the latest package lists from the repositories.
- Once the task finishes, click Upgrade. A shell window will open to complete the process. When prompted, confirm by typing
Yand pressing Enter. - Reboot your server if a new kernel was installed
Until I read this earlier I had no idea I had updated to v9, didn't even know it existed. I don't have any subscription, I just update it every month or so.
Hm... that's interesting.. Updates - that i do regularly, too (i have a reminder in HA for that) and i didn't receive any V8 -->V9 update back then.
I guess let's wait and see what will happen when (if) V10 comes out)...
I guess you get the major upgrades if you modified the sources.
Also, running that pveXtoX script (with --full switch) does a check and shows potential issues before upgrading.
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If you look in the Proxmox scripts here Community scripts for Proxmox you will find a script that will fix the repositories and turn off the subscription nag.
If you run Proxmox, and if you are reading this thread, you probably are, I very highly recommend that you install Proxmox Backup Server [PBS] on another machine [you CAN use a VM on Proxmox itself], but I use a regular Debian trixie install on an old Mac mini with 2TB of raid 0 disk and backup my cluster [of three] to that, installing PBS on that machine is pretty straightforward.
Backup before upgrading, just in case, set up the backups of your VM’s and containers to run every night and configure PBS to prune the number of backups so you don’t fill your backup disk.
Then you can upgrade following the upgrade instructions elsewhere in this thread, they work, but after the upgrade [and after every upgrade] you will need to rerun the script to disable the subscription nag. N.B. You don’t need to do this after every apt update/dist-upgrade, just version upgrades AFAIK.
And don’t neglect your backups, ever.
And sign up for the Proxmox forums, [but you might already have done so], the developers who work for Proxmox are on there and they will set you right if you make a mistake, I did and they saved me. I’m retired so I don’t have a spare 1500 euro or whatever for a subscription.
Did you run that before? Upgrade from 8 to 9 - Proxmox VE
huh… god only knows… it’s been a while…
Now i run HA bare, not inside proxmox anymore. When i’ve had to re-install all from scratch i did have all backups etc.. but, at closer look all was … just too complicated - tons of stuff to redo on newly installed proxmox (i couldn’t use backup, since i installed V9, while backup was V8). reinstall HA, other VM’s… 
Having bare haos is way easier: install haos, restore from ha backup, done.
I still run proxmox and some “less important” stuff, but it’s inside VM on my synology.