After upgraded to the netbox latest versions to v3.5.1

[littealvin]

Hello, It should be ok after I checked the dependencies to required versions as below.
https://github.com/netbox-community/netbox/blob/develop/docs/installation/upgrading.md

However, I got the server error after upgraded as below. It would be much appreciated if anyone can help on this.

Server Error
There was a problem with your request. Please contact an administrator.
The complete exception is provided below:

<class 'django.contrib.contenttypes.models.ContentType.DoesNotExist'>
ContentType matching query does not exist.

Python version: 3.8.10
NetBox version: 3.5.1

If further assistance is required, please post to the NetBox discussion forum on GitHub

[abhi1693]

Can you provide more stacktrace on the error as it is not possible to help with the provided message?

[Sawborg]

I got the same error when I upgraded tonight. My Netbox is borked. Haven't had issues in the past upgrading by cloning the git repo and running the upgrade script. This is what I get when I restart the services and open the URL to my login page. I believe I was running Netbox v3.2 or v3.3.

I ran the migration script manually but get errors when doing so. I stopped the server, restored from a backup that I took right before the upgrade, restarted the VM instance and I'm still getting the same error.

[Sawborg]

So I managed to fix this. I restored from my backup and tried the upgrade from the git repo again. I was getting the following error during the upgrade:

django.db.utils.DataError: Unable to proceed with deleting contact fields from Provider model: Found 8 providers with legacy contact data. Please ensure all legacy provider contact data has been migrated to contact objects before proceeding. Or, set the NETBOX_DELETE_LEGACY_DATA environment variable to bypass this safeguard and delete all legacy provider contact data.

I forced the legacy data deletion in the upgrade script: sudo NETBOX_DELETE_LEGACY_DATA=1 ./upgrade.sh

Restarted Netbox: sudo systemctl restart netbox netbox-rq

And we're back!