I try to install Piwik, but when I go to the browser tells me I have problems with creating a folder, not how to solve this problem, could someone help me?
Are you using Red Hat by any chance? If so, please try solution in https://github.com/piwik/piwik/issues/8918#issuecomment-147778190
More importantly, is SELinux currently enforcing? If so, the fix I've just verified is:
chcon -t httpd_sys_content_rw_t /var/www/html/piwik/tmp
chcon -R -t httpd_sys_content_rw_t /var/www/html/piwiki/tmp/tracker/
chcon -R -t httpd_sys_content_rw_t /var/www/html/piwik/tmp/cache
systemctl reload httpd.service
a new FAQ was published to hopefully summarise the solutions: How do I fix the errors “Unable to write in the cache directory” or “The directory matomo/tmp/cache/*” is not writable.”?.