SSH to LXC container with Pubkey

ssh [user]@[my-container-address]

Problem

[user]@[my-container-address] Permission denied (publickey). 

Solution

Change the sshd_config

vim /etc/ssh/sshd_config 

from this

# PubkeyAuthentication no

to this

PubkeyAuthentication yes

.
Do not forget to add your pubkey to your authorized keys.

mkdir /home/[myuser]/.ssh & vim /home/[myuser]/.ssh/authorized_keys