[mcswell]

Ok, I may try Mint.

You're right that I mixed up the Vivaldi repo (maybe you are the one who pointed that out on the thread I linked). But even after fixing that, it's still not working---slightly different warning message, but still about gpg.

[mcswell]

I've installed the Xfce Mint (you wren't the only one suggesting that). I don't have the same problems I had with Xubuntu, but I have different ones, like tearing on one of my two monitors. I initially had that with Xubuntu, but was able to find settings to fix it there-- IIRC by changing the refresh rate on that monitor. No luck so far on Xfce Mint. I've tried all seven of the Window Managers it offers, and both the configurations and most of the tweaks.

Also can't find the red mouse cursor theme that I had on Ubuntu. (If I could remember the name, I might be able to find it, but the "after market" mouse cursor themes I've found are so much eye candy--I just want an ordinary set of cursors, but red. Yes, I could probably generate my own, but I shouldn't have to.)

And when I reboot, the windows don't come up in the same place they were when I closed them. Some apps couldn't do that under Ubuntu either, but most could. I think it has to do with Wayland, but I'm not sure if it's even possible to go back to a purely X-windows system in Mint.

Sigh...