It depends. Speaking generally about installing a .deb package via dpkg or gdebi, which is not available in the currently set up repositories, I’d say it will NOT be updated via
Example: I install Davinci resolve via
dpkg -i from the .deb file, which was the output of Daniel Tufvessons
That will never be updated, unless I do install over it another version.
On the other hand, if the post-install script in the .deb does some action, which ensures it will be updated with the rest of the system via
apt update; apt upgrade then it will be upgraded…
Behind that is that installing such a .deb file also adds the repository which contains that .deb and will contain the newer updated versions of that package in the future. An example of that behavior is Skype and Google Chrome. Installing them via dpkg or gdebi results in having those packages installed, but also having their repositories added.
I’m on Debian, not Ubuntu, and I use the Debian port of LO from the backports repo. I’m satisfied with it.
Just say this, to make it clear that I won’t look deeper for ppa’s or such
So regarding your question, I don’t know how exactly LO .deb behaves, but if I had to guess I’d say it won’t be updated via ‘apt update’ if you install it the ‘dpkg -i’ way.
You can reinstall, but totally unnecessary. Just install the newer package over the existing one.
There will be no difference
Or even better, use a repository which holds the LO packages. This will be the most safe and convenient.