No, I didn't found any apparmor denials - the same is before and the same is after failing guest:
dmesg | grep -i apparmor [ 0.012143] AppArmor: AppArmor initialized [ 0.380003] AppArmor: AppArmor Filesystem Enabled [ 1.234176] AppArmor: AppArmor sha1 policy hashing enabled [ 10.461303] systemd[1]: systemd 232 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN) I even switched it off by: systemctl stop apparmor.service but nothing is changed. Guest is still fails to start. ** Changed in: libvirt (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1708013 Title: USB passthrough not working: failed to find host usb device 1:2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1708013/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs