"Check for Write Permissions: trying to update to 17.0.1

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I am trying to update my 17.0.0 installation to 17.0.1. I get the following when the updater stops.

Check for write permissions
The following places can not be written to:

    /var/www/html/nextcloud/updater/../console.php
    /var/www/html/nextcloud/updater/../robots.txt
    /var/www/html/nextcloud/updater/../remote.php
    /var/www/html/nextcloud/updater/../occ
    /var/www/html/nextcloud/updater/../COPYING
    /var/www/html/nextcloud/updater/../index.html
    /var/www/html/nextcloud/updater/../.htaccess
    /var/www/html/nextcloud/updater/../status.php
    /var/www/html/nextcloud/updater/../version.php
    /var/www/html/nextcloud/updater/../cron.php
    /var/www/html/nextcloud/updater/../AUTHORS
    /var/www/html/nextcloud/updater/../public.php
    /var/www/html/nextcloud/updater/../index.php
    /var/www/html/nextcloud/updater/../.user.ini

I’ve seen the solutions suggested to others (chown…) and this is not working for me.