unfortunately yet again bug report is closed with some excuses and
without actually doing a valid resolution of the problem...

here you can find an answer on how problem can actually be solved (many kudos 
to C Shore)
http://ubuntuforums.org/showpost.php?p=5042655&postcount=4

And here are the details from a man page of rpc.mountd:
       -g  or  --manage-gids
              Accept requests from the kernel to map user id  numbers  into
              lists  of group id numbers for use in access control.  An NFS
              request will normally (except when using  Kerberos  or  other
              cryptographic  authentication)  contains a user-id and a list
              of group-ids.  Due to a limitation in the  NFS  protocol,  at
              most  16  groups  ids can be listed.  If you use the -g flag,
              then the list of group ids received from the client  will  be
              replaced  by a list of group ids determined by an appropriate
              lookup on the server. Note that the ’primary’ group id is not
              affected  so  a  newgroup command on the client will still be
              effective.  This function requires a Linux Kernel  with  ver‐
              sion at least 2.6.21.

Does problem persists (ie current configuration doesn't address it)? YES
Does ubuntu come now with kernel > 2.6.21?  YES
Is it possible to solve the problem without much sweat? YES
Is default installation anyhow addresses or hints on possible solution? NO afaik

-- 
Permission denied when user belongs to group that owns group writable or setgid 
directories mounted via nfs
https://bugs.launchpad.net/bugs/110132
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