I already got report.html (optimization report), but don't known how to view it.
I tried complete command "firefox repotr.html" and expecting open it by web browser Firefox, but got:
Command 'firefox' not found, but can be installed with: apt install firefox Please ask your administrator.
Further I attempt to install it by command "apt install firefox", but of course I have "Permission denied":
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?