Today sees the first point release of Ubuntu 18.04 LTS, conveniently named 18.04.1 LTS. Point releases for an LTS include a roll-up of all bug fixes and security updates which have been pushed out since the original 18.04 LTS ISO was published in April. If you’re already running 18.04 LTS, and you have been updating regularly, then you will already have all of these applied and so essentially you’re already running 18.04.1 LTS.