Hot answers tagged byobu
He was probably using Byobu:
You have a couple of options... You can pass the ctrl-a through to vim by pressing ctrl-a then a again. You can switch byobu to use what we call emacs mode, where ctrl-a is not used as an escape (instead, the F12 is your escape). You can do this by running byobu-ctrl-a emacs You can change byobu's escape sequence entirely using F9 and selecting 'Change ...
You could open up a second connection to an other tty. Then you could use Ctrl+a,k to kill the screen window you are trapped in. To prevent this from happening for consecutive sessions you can define the escape character to e.g. Ctrl+e: # lxc-console -e '^e' -n containername
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