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This is what I got on server:

manuel@server ~ $ cat /etc/exports
  /var/share, sync)
manuel@server ~ $ cat /etc/hosts.allow 
manuel@server /etc $ cat /proc/filesystems | grep nfs
  nodev nfs
  nodev nfs4

This is what I get on my machine:

manuel@Timeline:~$ sudo mount -t nfs /media/share/
   mount: wrong fs type, bad option, bad superblock on,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       Manchmal liefert das Syslog wertvolle Informationen – versuchen
       Sie  dmesg | tail  oder so

server is Raspbian (Debian Wheezy) Timeline is Ubuntu 12.04

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/etc/export or /etc/exports? – Karlson Feb 19 '13 at 20:36
man exports. Normally filename should be /etc/exports. – Karlson Feb 19 '13 at 20:40
Have you changed filename on to /etc/exports? – Karlson Feb 19 '13 at 20:42
I just corrected it to /etc/exports. No improvement – ManuelSchneid3r Feb 19 '13 at 20:46
up vote 5 down vote accepted

Run exportfs -a on the server machine.

Also both machines have all of the needed NFS support packages and have nfs support? You can find if the kernel supports a specific filesystem by examining the output of cat /proc/filesystems.

And yes, the filename of the export file needs to be /etc/exports

Finally, check to see if you have enabled the NFS daemons during startup.

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Hurray I had syntax errors in /etc/exports +1 for exportfs -a. But showmount still shows no shares. I updated the question. "Finally, check to see if you have enabled the NFS daemons during startup." - How? – ManuelSchneid3r Feb 19 '13 at 20:53

The client needs nfs-common:

sudo apt-get install nfs-common

Refer: http://www.cyberciti.biz/faq/missing-codepage-helper-program-other-error/

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