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When i try to upgrade from 1.3.11 to 1.4.2, with utf-8 conversion appears this:

MediaWiki 1.4.2 installation

Please include all of the lines below when reporting installation problems.
Checking environment...

    * PHP 4.3.10-10ubuntu3: ok
    * PHP server API is apache; ok, using pretty URLs (index.php/Page_Title)
    * Have XML / Latin1-UTF-8 conversion support.
    * PHP's memory_limit is 20M. If this is too low, installation may fail!
    * Have zlib support; enabling output compression.
    * Turck MMCache installed
    * Found ImageMagick: /usr/bin/convert; image thumbnailing will be enabled if
you enable uploads.
    * Found GD graphics library built-in.
    * Installation directory: /var/www/enciclo14
    * Script URI path:
    * Connected as root (automatic)
    * Connected to database... 4.0.23_Debian-3ubuntu2-log; enabling MySQL 4
enhancements
    * Database wikidb exists
    * There are already MediaWiki tables in this database. Checking if updates
are needed...
    * DB user account ok

...linkscc table already exists.
...hitcounter table already exists.
...querycache table already exists.
...objectcache table already exists.
...categorylinks table already exists.
Creating logging table...ok
Creating user_rights table...ok
...have ipb_id field in ipblocks table.
...have ipb_expiry field in ipblocks table.
...have rc_type field in recentchanges table.
...have rc_ip field in recentchanges table.
Adding rc_id field to table recentchanges...ok
Adding rc_patrolled field to table recentchanges...ok
...have user_real_name field in user table.
Adding user_token field to table user...ok
...have ur_user field in user_rights table.
Adding log_params field to table logging...ok
...already have interwiki table
...indexes seem up to 20031107 standards
Altering lcc_title field from linkscc table... ok
Converting links table to ID-ID...
Schema already converted
Making img_name the primary key... Query "ALTER TABLE image ADD PRIMARY KEY
img_name (img_name)" failed with error code "".


How i can solve it?