AppArmor is like SELinux though: it's annoying so people just turn it off. Most recent example I encountered was on Ubuntu 1604; I wanted to run VMs under QEMU/

AppArmor is like SELinux though: it's annoying so people just turn it off. Most recent example I encountered was on Ubuntu 1604; I wanted to run VMs under QEMU/KVM with libvirt but AppArmor was preventing the VM from using a USB device from the host. Just by chance I took a look at dmesg and saw some audit message about qemu bridge helper.