Any plans to update install script to support Ubuntu 18.04 LTS?

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Sure at some point when the upgrade path for pro installs has been sorted.

Until then, my impression from the other thread is that it is safe to install on Ubuntu 16.04 LTS and then upgrade 16 to 18?

any updates on this front?

QB pro runs just fine on 18!
https://quickbox.io/quickbox-edition-comparison/

any plans to update community for 18?

not at all sadly - would be done if a community user decided to do it!