[ubuntu] 12.04 x64 Samba - access problems after upgrade

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http://ubuntuforums.org – I have recently upgraded a server running 8.04 to 12.04. I achieved this by installing 12.04 'over the top' of 8.04 without a format of the partition. The server appears to work correctly except for an intermittent/sporadic problem with a Samba share. Samba is the only real reason for them running Ubuntu on a server. The company have 10+ PC running Windows XP and Windows 7 and all company shared data is accessed via a drive mapped to a Samba share. When I set this up on 8.04 several years ago I set it up with minimal security and usernames and passwords are not required to allow full read/wr (Hardware)