[Bug 1582854] Re: mount -t nfs not working in ubuntu 16.04

[Manfred Grabherr]

After a lot of digging, I found a solution/workaround. The problem is
the nfs version, in short:

sudo mount -t nfs o nfsvers=2 server:/<serverdir> <localdir>

does the trick. Anyway, here is what happens without specifying the
nfsvers option:

sudo mount -t nfs -v server:/<serverdir> <localdir>

mount.nfs: timeout set for Sat May 21 11:59:43 2016
mount.nfs: trying text-based options 'vers=4,addr=192.168.1.133,clientaddr=192.168.1.25'
mount.nfs: mount(2): Stale file handle

Version 3 also does not work:

sudo mount -t nfs -v o nfsvers=3 server:/<serverdir> <localdir>

mount.nfs: timeout set for Sat May 21 12:00:12 2016
mount.nfs: trying text-based options 'nfsvers=3,addr=192.168.1.133'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.133 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.133 prog 100005 vers 3 prot UDP port 55187
mount.nfs: mount(2): Stale file handle

Finally, this does work:

sudo mount -t nfs -v o nfsvers=2 server:/<serverdir> <localdir>

mount.nfs: timeout set for Sat May 21 12:00:33 2016
mount.nfs: trying text-based options 'nfsvers=2,addr=192.168.1.133'
mount.nfs: prog 100003, trying vers=2, prot=6
mount.nfs: trying 192.168.1.133 prog 100003 vers 2 prot TCP port 2049
mount.nfs: prog 100005, trying vers=1, prot=17
mount.nfs: trying 192.168.1.133 prog 100005 vers 1 prot UDP port 34856

Again, the NFS server runs Ubuntu Desktop 14.04, nfs export is done
without any specific options wrt the nfs version.

So maybe this is not a bug per se and it is just that the default for
the version has changed, but IMHO, a meaningful error message would be
*a lot* better than just timing out without any additional information.

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https://bugs.launchpad.net/bugs/1582854

Title:
  mount -t nfs not working in ubuntu 16.04

Status in util-linux package in Ubuntu:
  New

Bug description:
  After upgrading from 15.10 to 16.04, the command

  sudo mount -t nfs Biest:/<path_to_shared_dir> /home/manfred/BigDisk/

  times out without any further error reporting:

  mount.nfs: Connection timed out

  It worked on the same machine before the upgrade, and it still works
  from both a 14.04 and a 15.10 machine. The file server is running
  14.04.

  Additional info: I just updated today (05/17/2016). Let me know what
  else you need. Other people seem to have the same or similar problems,
  but no official bug report, fix, or workaround to be found. Only
  viable option I have now is to downgrade to 15.10.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: mount 2.27.1-6ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue May 17 20:57:58 2016
  InstallationDate: Installed on 2015-06-27 (325 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to xenial on 2016-04-30 (16 days ago)

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