Could you try the workaround in: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/302092/comments/4
Is it a 8.04 box that was upgraded to 8.10 ? Did sudo start to fail as soon as you upgraded, or did it start to fail some time after ?
Could you try the workaround in: /bugs.launchpad .net/ubuntu/ +source/ samba/+ bug/302092/ comments/ 4
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Is it a 8.04 box that was upgraded to 8.10 ? Did sudo start to fail as soon as you upgraded, or did it start to fail some time after ?