Upgrade did not complete

Hello,
After having some problems, I upgraded to version 2.8.4. I went to the admin page and clicked on the Upgrade WordPress Database, then a short time later my neighbourhood had a power outage.

Now, my main page is visible, but my subpages are not. When I click on my admin page, I get the original “upgrade wordpress database” page again. But when I click on the button, I get the error message pasted below. Any suggestions for a remedy?

Many thanks,
Jennifer

HTTP Error 502.2 – Bad Gateway
The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are “WordPress database error Duplicate key name ‘comment_approved’ for query ALTER TABLE wp_comments ADD KEY comment_approved (comment_approved) made by wp_upgrade, make_db_current_silent, dbDelta WordPress database error Can’t DROP ‘option_can_override’; check that column/key exists for query ALTER TABLE wp_options DROP option_can_override made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Can’t DROP ‘option_type’; check that column/key exists for query ALTER TABLE wp_options DROP option_type made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Can’t DROP ‘option_width’; check that column/key exists for query ALTER TABLE wp_options DROP option_width made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Can’t DROP ‘option_height’; check that column/key exists for query ALTER TABLE wp_options DROP option_height made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Can’t DROP ‘option_description’; check that column/key exists for query ALTER TABLE wp_options DROP option_description made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Can’t DROP ‘option_admin_level’; check that column/key exists for query ALTER TABLE wp_options DROP option_admin_level made by wp_upgrade, upgrade_all, upgrade_230_options_table WordPress database error Duplicate entry ‘1’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (1, ‘a life’, ‘life-2’, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ‘1-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 1, ‘category’, ‘Just a journal entry.’, 0, 57) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ‘3’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (3, ‘go find yours’, ‘go-find-yours-2’, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ‘3-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 3, ‘category’, ‘Find a similar inspiration in your life.’, 0, 6) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ‘4’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (4, ‘creative play’, ‘creative-play-2’, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ‘4-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 4, ‘category’, ‘You try it!’, 0, 11) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’23’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (23, ‘lifelong learning’, ‘lifelong-learning-2′, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’23-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 23, ‘category’, ‘About lifelong learning.’, 0, 10) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’24’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (24, ‘food’, ‘food-2′, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’24-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 24, ‘category’, ”, 1, 6) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’25’ for key 1 for query INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (25, ‘friendship’, ‘friendship-2′, 1) made by wp_upgrade, upgrade_all, upgrade_230 WordPress database error Duplicate entry ’25-category’ for key 2 for query INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 25, ‘category’, ”, 1, 4) madX-Powered-By: PHP/5.2.6 Content-Type: text/html; charset=UTF-8 <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”&gt; <html xmlns=”https://www.w3.org/1999/xhtml&#8221; dir=”ltr” lang=”en-US”> <head> <meta http-equiv=”Content-Type” content=”text/html; charset=UTF-8″ /> <title>WordPress › Upgrade</title> <link rel=’stylesheet’ id=’install-css’ href=’https://realia.ca/wordpress/wp-admin/css/install.css?ver=20090514&#8242; type=’text/css’ media=’all’ /> </head> <body> <h1 id=”logo”><img alt=”WordPress” src=”images/wordpress-logo.png” /></h1> <div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '1' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (1, 'a life', 'life-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '1-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 1, 'category', 'Just a journal entry.', 0, 57)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '3' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (3, 'go find yours', 'go-find-yours-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '3-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 3, 'category', 'Find a similar inspiration in your life.', 0, 6)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '4' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (4, 'creative play', 'creative-play-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '4-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 4, 'category', 'You try it!', 0, 11)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '23' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (23, 'lifelong learning', 'lifelong-learning-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '23-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 23, 'category', 'About lifelong learning.', 0, 10)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '24' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (24, 'food', 'food-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '24-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ( 24, 'category', '', 1, 6)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '25' for key 1]
INSERT INTO wp_terms (term_id, name, slug, term_group) VALUES (25, 'friendship', 'friendship-2', 1)</p> </div><div id=’error’> <p class=’wpdberror’>WordPress database error: [Duplicate entry '25-category' for key 2]
INSERT INTO wp_term_taxonomy (term_id, taxonomy, descript".