One, maybe two-liners ...

[DennisLfromGA]

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Package manager commands -

# Update installed packages

sudo apt-get    update   &&
sudo apt-get -y upgrade

# Fix & Cleanup Up Apt Packages, etc. -

sudo apt-get -f install    &&
sudo apt-get    autoremove &&
sudo apt-get -y autoclean  &&
sudo apt-get -y clean

# Show packages manually installed

zgrep 'Commandline: apt' /var/log/apt/history.log /var/log/apt/history.log.*.gz

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Storage commands -

# Create a volume to use in the container(s) and then list it

lxc storage volume create default removable
lxc storage volume list default

# Then attach new volume to container(s)

lxc storage volume attach default removable penguin /data
lxc storage volume attach default removable stretch /data

# Configure the container to run with host-equivalent privileges... (removed)

lxc config set stretch security.privileged true
lxc config set MrUrbanity security.privileged true

# Mount & share the 'lxd_conf' directory in your containers with:

lxc config device add penguin lxd-conf disk source=$LXD_CONF path=/mnt/lxd_conf
> Device lxd-conf added to penguin   

lxc config device add stretch lxd-conf disk source=$LXD_CONF path=/mnt/lxd_conf
> Device lxd-conf added to stretch   

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[DennisLfromGA]

Tweaking to add penguin.