Further to comment #38, here's a workaround that works for me on 20.04:
sudo killall apt
sudo rm /var/lib/dpkg/lock
sudo dpkg -r snapd gnome-software-plugin-snap
sudo apt update
sudo apt full-upgrade
** Changed in: snapd
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1776622
Title:
snapd updates on focal never finish installing. Can't install any
other updates.
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