lxc-start -n u1 -l DEBUG -F
lxc-start: utils.c: safe_mount: 1692 Invalid argument - Failed to mount /sys/kernel/debug onto /usr/lib/x86_64-linux-gnu/lxc/sys/kernel/debug
lxc-start: lsm/apparmor.c: apparmor_process_label_set: 220 If you really want to start this container, set
lxc-start: lsm/apparmor.c: apparmor_process_label_set: 221 lxc.aa_allow_incomplete = 1
lxc-start: lsm/apparmor.c: apparmor_process_label_set: 222 in your container configuration file
lxc-start: sync.c: __sync_wait: 57 An error occurred in another process (expected sequence number 5)
lxc-start: start.c: __lxc_start: 1354 failed to spawn 'u1'
lxc-start: tools/lxc_start.c: main: 344 The container failed to start.
lxc-start: tools/lxc_start.c: main: 348 Additional information can be obtained by setting the --logfile and --logpriority options.