On apt information, adding -y to apt-get install commands would be useful. At least the first one like

sudo apt-get install -y software-properties-common

If you want to leave the last install of mariadb without a -y for confirmation I think that's ok, but at least make the presented instructions copy/pasteable.

Can we include the debuginfo add-apt-repository in the main instructions? Its a fairly small extra amount of detail to download. The hopefully last thing an installing user is thinking about when installing is debuginfo, however by the time they need it they may be at a loss as to where to get it.

Some crash handling is smart enough to search for debsym packages so having the repo available would enhance user (and developer) experience at a time of need.