I tried the forced upgrade as suggested. I get this output during the upgrade:
WordPress database error: [Multiple primary key defined]
ALTER TABLE wp_term_relationships ADD PRIMARY KEY (object_id,term_taxonomy_id)
WordPress database error: [Table ‘ubuntutu_wrdp1.wp_categories’ doesn’t exist]
SELECT * FROM wp_categories ORDER BY cat_ID
WordPress database error: [Table ‘ubuntutu_wrdp1.wp_post2cat’ doesn’t exist]
SELECT * FROM wp_post2cat
WordPress database error: [Table ‘ubuntutu_wrdp1.wp_link2cat’ doesn’t exist]
SELECT * FROM wp_link2cat
…and the error still persists.
