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GNOME 45 beta: Less buggy, more colorful, and still not your grandma's desktop
(www.theregister.com)
The GNOME Project is a free and open source desktop and computing platform for open platforms like Linux that strives to be an easy and elegant way to use your computer. GNOME software is developed openly and ethically by both individual contributors and corporate partners, and is distributed under the GNU General Public License.
My 75 year old father in law have been running vanilla gnome for the last 5 years. Turned out to be less confusing than Windows and less ways to mess up the computer. Only support I had last year was when the printer queue was paused for som reason. But I also helped a relative with the same thing on Windows 11 a few weeks ago, so that seems to not be a Linux issue.
So, Gnome is pretty much suitable for your grandma.
Why are printers always the thing? I'm "good at computers" so my family is always asking me to fix their damn printer.
To be fair printers suck and no one wants to deal with them