@xray2000 The method I have used to install apps is

$ sudo mv $APP ~/anbox-data/data
$ sudo lxc-console -ndefault -P /home/phablet/anbox-data/container -t0
$ cd data && pm install "app.apk"

substitute "app.apk" for the name of the apk you are installing and $APP for it's path outside anbox

EDIT: sorry, I miss typed the sudo command.