Unable to archive reports; modules CURL and GD already loaded

I’m unable to archive reports; I keep getting messages that modules CURL and GD already loaded. What do I need to do to get around this problem?

INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] ---------------------------
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] INIT
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] Running Piwik 2.16.0 as Super User
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] ---------------------------
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] NOTES
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - If you execute this script at least once per hour (or more often) in a crontab, you may disable ‘Browser trigger archiving’ in Piwik UI > Settings > General Settings.
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] See the doc at: How to Set up Auto-Archiving of Your Reports - Analytics Platform - Matomo
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - Reports for today will be processed at most every 150 seconds. You can change this value in Piwik UI > Settings > General Settings.
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - Reports for the current week/month/year will be refreshed at most every 3600 seconds.
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - Archiving was last executed without error 109 days 8 hours ago
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - Will process 33 other websites because some old data reports have been invalidated (eg. using the Log Import script) , IDs: 1, 2, 4, 5, 6, 7, 9, 10, 11, 14, 15, 18, 19, 20, 21, 22, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] ---------------------------
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] START
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] Starting Piwik reports archiving…
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] Old report was invalidated for website id 1
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] Will pre-process for website id = 1, period = day, date = last52
INFO CoreAdminHome[2016-02-17 20:58:16] [3e824] - pre-processing all visits
ERROR CoreAdminHome[2016-02-17 20:58:23] [3e824] Empty or invalid response 'PHP Warning: Module ‘curl’ already loaded in Unknown on line 0 PHP Warning: Module ‘gd’ already loaded in Unknown on line 0 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hi there, Something is wrong with your PHP.ini configuration somehow. Please check online for pointers.

I wound up “brute force” fixing it by running this once a week. It disables curl and gd, runs the archiving, then reenables curl and gd:

cd /etc/php5/mods-available
mv curl.ini curl.old
mv gd.ini gd.old
service apache2 reload
su www-data -c "/usr/bin/php5 /var/www/mysite/piwik/console core:archive --url=http://www.mysite.com/"
mv curl.old curl.ini
mv gd.old gd.ini
service apache2 reload