My JIRA was installed on Ubuntu Server 16.04. I used the terminal to access the log files located at /var/atlassian/application-data/jira/log/atlassian-jira.log. I used sudo account and was able to change the directory to /var/atlassian/application-data/, but when I wanted to go further to /var/atlassian/application-data/jira directory with sudo account, I got: Permission denied. I am not allowed to get my log files. What is preventing sudo from access jira directory?