Can't use HTTPS: "URL /index.php/apps/files/ not found"

[andrey-utkin]

Ubuntu 14.04.3. Owncloud advertised repositories.
Have tried this with fresh installs of owncloud 8.1 (stable), testing (8.2...-RC...), nightly (8.1-20151108). HTTP works, HTTPS doesn't, giving this after login page:

Not Found

The requested URL /index.php/apps/files/ was not found on this server.

/etc/apache2/sites-enabled/oc.example.org-le-ssl.conf:

<IfModule mod_ssl.c>
<VirtualHost *:443>
        ServerName oc.example.org
        ServerAlias oc.example.org
        DocumentRoot "/var/www/owncloud"
        <Directory   "/var/www/owncloud">
        AllowOverride All
        order allow,deny
        Allow from all
        </Directory>

SSLCertificateFile /etc/letsencrypt/live/oc.example.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/oc.example.org/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateChainFile /etc/letsencrypt/live/oc.example.org/chain.pem
</VirtualHost>

</IfModule>

[RobinMcCorkell]

Duplicate of #20202

[ghost]

Fixed now in Let's Encrypt with certbot/certbot#1390