Hello,
I'm looking for a Linux distro that I could recommend to friends who are
rather frustrated with Windows 10.
The friends in question ask me about how to fix problems with their
computers from time to time.

The essentials would be:
-has a *good* Windows migration assistant, which must be able to handle
Windows 10; I know that Ubuntu used to have this.
-glibc-based, so that Flash and Avast Workstation will work
(at least one of the friends in question uses avast on Windows)
-has Chromium (and preferably Chrome)
-has Open/LibreOffice (one of the friends in question has used OpenOffice
on Windows since...7 or 8 years ago, I think)
-DE familiar to Windows users (if Trinity were more active, I'd go with
that without hesitation; but I suspect properly configured Xfce or Mate
may be better at this point.)
-can install to hard drive, though support for Live CD is desired.
-binary based

Highly preferred:
-not rolling release, since one of the friends in question is rather
upset about the new Windows mandatory automatic update policy.
-non-systemd based, so that I can help debug issues; OpenRC or sysv-rc
preferred
-dpkg/apt based, since that's the package manager I'm most familiar with.
-easy-to-navigate system administration GUI.
-wireless GUI that doesn't require preconfiguring wpa_supplicant.

A lot of these features are not what I use:
I last migrated from Windows about 5 years ago, so I have no idea
what the state of the art is; I use Links, Otter, and Iceweasel;
I haven't used OO/LO much in the last 3 years; I spend most of my time
in the terminal; the only desktop I use is CDE; ...
So I'd like some recommendations for something a little more mainstream.

Thanks,
Isaac Dunham