It appears that you have a default installation of AppArmor with default profile. It would be a good idea to use Ubuntu's control panel to start AppArmor and look over the default profile. You may want to change one or more settings. Open a browser (whatever Ubuntu provides) to use www.google.com/linux
to research items in the AppArmor config as you peruse the AppArmor profile. The google link filters out most non-linux returns.
I would be more concerned about this:
init: Failed to spawn network-manager main process: unable to execute: No such file or directory
You may want to try, in a terminal, the dmesg command to see in you get more information about the "Failed to spawn" error, or try "tail /var/log/messages" which will display the last 10 lines of messages. You can increase the line count with "tail -n XX /var/log/messages" where XX is the number of line to display. Note that you have to be root to see the contents of /var/log/messages. So, run the tail command with either su or sudo: sudo tail -n XX /var/log/messages.