NFSv2 no longer exists in 23.04?

[Manuel Castro]

I am using u-boot based hardware that still uses NFSv2.
With Ubuntu 23.04 I am unable to activate version 2 of the protocol for the NFS server.
Thus, Ubuntu cannot be used as a development tool for this type of equipment!

Description: Ubuntu 23.04
Release: 23.04

[Ian Rees (ian.rees)]

I'm running 22.04.2 LTS, trying to boot a device with an old U-Boot that only supports NFSv2 and is currently failing.

Newish Linux kernels have deprecated support for serving NFSv2, but my system is running 5.15.0-78 which should support NFSv2 if NFS server support is enabled. Not sure what's going on there.

[Andreas Hasenack (ahasenack)]

UDP for NFS mounts has been disabled since Ubuntu 20.10 ("Groovy Gorilla"), maybe that's what is failing for you.

There is an entry in the Jammy release notes[1] about it, search for the header "UDP disabled for NFS mounts".

1. https://discourse.ubuntu.com/t/jammy-jellyfish-release-notes/24668

[Ian Rees (ian.rees)]

Thanks Andreas! I should have written in my comment, that this same arrangement worked until recently (not sure exactly when, sometime in the last few weeks). The Ubuntu computer is serving NFS, and the device U-Boot only supports NFSv2 .

My colleague is also running 22.04 and encountering the same symptoms as mine, but my kernel is 5.15.0-78 and theirs is 6.2.0-26 . It's not clear to me why mine hasn't also updated to 6.2 , but in any case the 6.2 kernel has deprecated NFSv2 support so it seems we will need to figure out a long term solution even if the immediate issue can be resolved.