Can confirm. I persuaded my wife to switch to Linux some 10 years ago. She's still using Linux to this day, but I've been her tech support for all these years. On the bright side, I've become very good at troubleshooting
Go Kubuntu if you want Ubuntu and Windows-like. Otherwise, Mint is a solid choice for a Windows user too, I believe Mate and Cinnamon both are very similar UI to Windows. Sadly Mint only does LTS versions now, but maybe that's for the best if your GF isn't super into tech?
No screen tearing never. My laptop saw a significant battery life boost (basicly doubled) when I switched DWM into DWL but I don't know exactly why.
And because Wayland is the future and xorg decrepatec, why you'd recommend xorg for anybody since they must swtich at some point and I doubt even the most basic user can make that transition 100% flawlessly.
My dad also made the switch to mint cinnamon about 3 years ago and I only had to fix things once for him (which was something in partitioning/fstab he or the installer messed up), he has successfully updated and maintained the system for 3 major releases yet and is even happier with Linux on his home laptop than with windows on his work laptop
Edit: he's not really tech savvy or something, he's a teacher by profession
KDE is more similar to windows, Gnome is maybe closer to MacOS.
But generally, KDE felt always a bit "super user" to me, and I found the amount of customizability and features more overwhelming than useful.
Gnome is simple, clean, and I prefer it for that reason.
Linux Mint is the way to go. It's by no means a clone of Windows(yuk) but has a "start button", vertical menu with apps listed and a bottom taskbar. So it should be very easy to use and get used to.
While Gnome can be shaped into something Windowslike with extensions 'Arcmenu' and 'Dash to Panel', for another user I'd suggest just using a DE that already works like that. Best choices IMO are Cinnamon or KDE.
Since you already want to use a Ubuntu desktop, I'll stick to suggesting Ubuntu flavours. KDE on Ubuntu, you'll want Kubuntu. For Cinnamon, there is a Ubuntu Cinnamon flavour.
KDE is somewhat more modern-feeling than Cinnamon but also uses more resources. If your GF's system is a bit weak, maybe go for Cinnamon. Cinnamon is also a bit retro in it's design, so it might be more comfortable for people used to older Windows versions.
I recommend downloading a live installer for both, showing her them and letting her pick the one she likes the most. (On that note, I hope you got her permission to do this...)
Well cinnamon and plasma are good options, those de are widely available. Zorin os was a quick select option that lets you go from windows 7 to windows 10 to mac with a wimple click.
If you must use ubuntu, you'll ultimately be tied to the desktop environments that ubuntu offers. Personally I don't think ubuntu works well, especially outside of their gnome offshoot Unity DE. If you must use ubuntu I would say install kubuntu which has KDE Plasma on it. KDE Plasma is highly customizable, quite pretty and pretty easy to use.
There are minor distros deliberately styled to look like various versions of Windows. Someone already mentioned Zorin; I'll add Q4OS. Even if you don't want to support one of them in the long term, it might be worth picking up some live media and poking around to see what they did, depending on how much your GF depends on everything on the system being just exactly as she expects.
Cinnamon has an official Ubuntu flavor now. I would recommend that over Mint, since mint is LTS-only. You can also do KDE-Plasma, but my personal preference is Cinnamon.
Where is that info coming from? To my experience Plasma is even lighter than GNOME, or just a tiny bit more resource hungry than something truly lightweight like XFCE. It doesnt really need powerful computer.
Yeah on modern hardware, resource usage by the DE is negligable compared to what some applications use (for example web browsers, or chromium based apps).
If you want her hooked; make it better (not like). You're taking away Adobe, Office, Games, Topaz and other proprietary software, and you want to make it 'like' windows to boot? Outside of conspiracy theories about privacy and stuff, and people expecting an OS to run smooth at minimum specs; there isn't much reason to use Linux over Windows, besides dynamic tiling window managers. I'd think you were an idiot if I were her, and you gave me the popular response here.