I wanted to make chromium (chrome) more secure. Just to be safe. I found out that the package apparmor-profiles on Ubuntu contained an apparmor profile for chromium-browser. I installed it and tried to enforce it without using the aa-enforce binary (which required the apparmor-utils package) but I couln’t get that to work. So I installed apparmor-utils anyway.

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sudo apt-get install apparmor-profiles apparmor-utils
sudo aa-enforce /usr/bin/chromium-browser /usr/lib/chromium-browser/chromium-browser

When all is done, quit the chromium browser and restart it. Then, when you run aa-status it should list chromium-browser as ‘enforced’.

I tried to do the same thing for /usr/sbin/dovecot but that didn’t quite work. Dovecot threw errors like:

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init: dovecot main process (8738) terminated with status 84

I tried fixing it but I didn’t get it to work so I gave up.