How do I solve You don't have permission to access this resource?

It sounds like you might be encountering a 403 permissions error described in these two Community posts:

• Getting "403 Forbidden" after scale my linode | Linode Questions
• I'm getting a 403 Forbidden error when visiting my subdomain | Linode Questions
• 403 Forbidden error when trying to access my WordPress site | Linode Questions
• Apache 403 Forbidden Error | Linode Questions

As I understand the issue as you've described it, you need to check file/directory permissions to make sure Apache2 is able to access the files it needs to serve. You can check the following logs to see if it reveals which files it cannot access:

/var/log/apache/access.log
/var/log/apache2/access.log
/var/log/httpd/access.log

Additionally, this solved post on StackOverflow goes into much deeper detail about individual causes for these permission errors and how to resolve them:

• apache - Error message "Forbidden You don't have permission to access / on this server" - Stack Overflow