Comment 5 for bug 1835102

Found a workaround:

When update/installation is stuck, just open a second terminal and
stop snapd and snapd.socket.

# sudo systemctl stop snapd
# sudo systemctl stop snapd.socket

The installation in the first terminal should continue. After doing this, the issue didn't surface so far.

(Don't forget to start the processes again)

Cheers,
MrWorta.