System locked up during upgrade 18.04 to 20.04

[REUBY Dianne]

Upgrade from 18.04 to 20.04 stopped at "upgrading snap snap-store", no mouse, no screen updates (battery percentage etc) so eventually I had to do a hard shutdown and restart. 

I have a system, Chromium has updated as I got the "welcome" page but also has my bookmarks, extensions, etc. Sidebar shows my favourites, top bar shows my normal apps, "About" shows 20.04 LTS.

What should I do now?

TIA

Dianne
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