@advocatux Yes, I had it installed and did typed the commands on the M10 itself.

@Lakota Thanks for the advice (and the question from a while ago)!
https://forums.ubports.com/topic/262/desktop-apps?page=1

Thanks to you all, I now have the Firefox, Libreoffice, and even the V.L.C. Player & Ubuntu Restricted Extras I'd forgotten running on my Aquaris F.H.D. with the latest O.S release, plus learned how to use a container for the first time. Thanks again!

Anyone know when the legacy app.'s are updated?

Likewise, I tried installing the font manager 'Fonts" to install a modified segoeui.fft, but the installation ended with [code]E: Unable to locate package fonts[/code], so Fonts doesn't appear in Deskop Apps. Is this fixable?

@advocatux Thanks for the suggestin of using a live U.S.B.! I worked! (In fact, I'm replying with the newly upgraded tablet.)

Now, if I could only get the "Desktop Apps" App to work, things would be perfect. It would be great to finally have Firefox, Open/Libre Office, etc running in the M10. But, following the instrucions seems more complicated than expected.

With UBports' instructions, even 1-word container identifiers (like 'DesktopCv001') are invalid. (May i ask how containers are identified, then, please?)
https://docs.ubports.com/en/latest/userguide/dailyuse/libertine.html
So, I can't get past the 1st line of code on Terminal.

Yet, what's used here are allowed.
https://forums.ubports.com/topic/262/desktop-apps?page=1
But, the setup fails due to dependency issues. So, i can't get past the 1st line again.

I've been doing this on the device itself. Tomorrow, I'll try again on a live U.S.B.