Latest 16.04 bug: NFS problem - no access unless I use root first - strange...

[oshunluvr]

I'm using NFSv4 on Ubuntu server 14.04, fully updated, etc. I've been using this setup for quite some time (years).


On my new 16.04 install, I just noticed I couldn't browse my NFS shares sub-directories. They mount without error and I can list the root directory, but attempting to list sub-directories results in "cannot access 'foldername/': Operation not permitted." But if I do a listing with sudo it works, and I can then list all the nested files and subfolders.

Setup is exactly the same as my 15.04 install where all works as expected. User groups, permissions, fstab mount, hostnames, all the same. I'm open to suggestions, but I realize most of you don't use NFS daily like I do.

Fstab line:

server:/ /shared nfs4 auto,bg,soft,users,rsize=65536,wsize=65536,noatime,x-systemd.automount 0 0

showmount output:

Export list for server:
/exports 192.168.1.0/24

Obviously, subvolume permissions are all the same.

[Guest]

I got the same error messages "cd ... Operation not permitted" when my PC was upgraded to kernel 4.4.0-31.
The error disappeared when I booted my PC back to kernel 4.4.0-28.

[oshunluvr]

Added strangeness: If I access a folder (using sudo), I can then access it from my regular user. But if I don't continuously (like have dolphin open on that folder) access it, my ability to access it times out.