I've upgraded my D5 installation and got this error:

user warning: Duplicate entry '321-0' for key 1 query: ALTER TABLE locales_target ADD PRIMARY KEY (language, lid, plural) in C:\Inetpub\wwwroot\drupal6\includes\database.mysql-common.inc on line 374.

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catch
he/him
Primary language English
commented
Status: Active » Closed (duplicate)

Marking duplicate of #223077: update 5.7 to 6.0 failed "ALTER TABLE {locales_target} ADD PRIMARY KEY (language, lid, plural)".