Support for 16.04 will be ending next April, so now is the time to start planning what you will do then. I had an nVidia 7200 GS card that lost proprietary support from nVidia for the 16.04 release. There is the nouveau driver available in the newer versions, but I couldn't get it to run at the resolution desired. $70 and a new GPU solved that issue. If solving a problem will take over 4 hrs or $70 solves it, I'll pay the $70 every time.
I'll be upgrading our 16.04 systems this fall sometime. Timing depends on support for each application with newer releases. I really want to skip 18.04 completely, but a few of the applications usually take 12 months before they support the current LTS, so timing could be too tight.
As for using lighter Ubuntu - any of the other flavors will be lighter than the normal, default, Ubuntu Desktop running Gnome3. Xubuntu, Lubuntu, Ubuntu-Mate are all choices. Some have a "minimal" desktop option - but that does the normal install, then removes the other packages. I complained that the minimal install included a browser - the team decided that a browser wasn't optional. I suggested lynx, since obviously, anyone desiring a minimal install would happily accept a minimal browser. Overruled again.
If you don't load Gnome3, you won't get any 'lense' stuff.
There is also the "alternate installer", but that is more hassle than just removing the packages, IMHO. If you need to do this often, make a list and keep that list in a file that is part of your backups. Every time you find another package to remove, just add that to the list. I use ansible and have config modifications, new packages to be installed and other packages to be removed from all my systems. It is always becoming more complete, more automatic, and more consistent that way.
If you install the server version, then you won't care about the proprietary GPU driver. Server doesn't have a GUI. It is certainly lighter than any desktop. The CPU isn't wasting time with GUI processing. That's a good thing.
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