Public bug reported:
I'm running `5.13.0-1011-raspi #13-Ubuntu SMP PREEMPT Fri Nov 19
18:40:23 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux` and have
successfully set up netbooting on my RPi 4B (4GB). When I do not specify
a `vers=` in cmdline.txt, NFS version 3 is used. I'd like to move to
version 4, but unlike the setup described in
https://forums.raspberrypi.com/viewtopic.php?p=1751741#p1751741, I
cannot get `vers=4` (or any sub-version to work): the console logs
`invalid value for vers.` for whatever I try.
Current working cmdline.txt:
```
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs
nfsroot=192.168.3.101:/srv/pinet/root,tcp ro ip=dhcp rootwait fixrtc splash
```
Nonworking cmdline.txt:
```
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs
nfsroot=192.168.3.101:/srv/pinet/root,tcp,vers=4 ro ip=dhcp rootwait fixrtc
splash
```
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1954716
Title:
rpi nfsroot vers=4 not supported anymore?
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