This problem certainly does appear to be related to the edgy kernel. The best solution for me was to reinstall the the dapper kernel and restricted modules package on the server – this fixed my NFS and also keeps my nVidia graphics card happy. All NFS clients can continue to run the edgy kernel.
In my case I fixed the problem as follows: 1.Edit /etc/apt/sources.list to add dapper repositories (I added the following) deb http://gb.archive.ubuntu.com/ubuntu/ dapper main restricted universe deb http://gb.archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe deb http://archive.ubuntu.com/ubuntu/ dapper-backports restricted main universe 2.Install linux-image-2.6.15-27-686 and linux-restricted- modules-2.6.15-27-686 using either apt-get or synaptic. 3.Edit /boot/grub/menu.lst to move the 2.6.15-27-686 kernel entry above the 2.6.17-10-generic entry. 4.Reboot. This seems like a bit of a hack but it does work. Previously when running the edgy kernel on the NFS server, I found that network shares did not always show up when executing “sudo mount” on remote hosts (although they were mounted). Since installing the dapper kernel on the NFS server, the shares show up as expected. As you say, good job the community is on the case here – there is no way I would have thought of installing another kernel to fix this without the information posted here, so thank you. In view of the seriousness of this issue, it is very disappointing that no official fix has been made available since the bug was first reported in September. -- Permission Denied on nfs clients for only some files https://launchpad.net/bugs/62308 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs