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Using Let's Encrypt for ssl, no problems with WordPress. Installation and plugin activation for CiviCRM led to a blank page. Apache2 log looks like this:

[Wed Jul 05 13:58:40.895212 2017] [ssl: warn] [pid 30451] AH01909: p:443:0 server certificate does NOT include an ID which matches the server name
[Wed Jul 05 13:58:40.922645 2017] [ssl: warn] [pid 30452] AH01909: p:443:0 server certificate does NOT include an ID which matches the server name
[Wed Jul 05 13:58:40.924775 2017] [mpm_prefork: notice] [pid 30452] AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2l configured -- resuming normal operations
[Wed Jul 05 13:58:40.924794 2017] [core: notice] [pid 30452] AH00094: Command line: '/usr/sbin/apache2'
[Wed Jul 05 14:04:22.208994 2017] [:error] [pid 30478] [client 176.126.252.12:40655] PHP Fatal error:  Uncaught CRM_Core_Exception: [0: Found installation canary. This suggests that something went wrong with tracking installation process. 
[Wed Jul 05 14:06:40.022932 2017] [:error] [pid 30464] [client 176.126.252.12:60919] PHP Fatal error:  Uncaught CRM_Core_Exception: [0: Found installation canary. This suggests that something went wrong with tracking installation process. Please post to forum or JIRA.\n\n  thrown in /var/www/wp-content/plugins/civicrm/civicrm/Civi/Core/InstallationCanary.php on line 53, referer

Checked ownership and permissions on plugin files. Nothing unusual there.

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