Bug#1012185: electrum: 'SilentTaskGroup' object has no attribute '_closed'

[Vincas Dargis]

Workaround is to downgrade python3-aiorpcx package like this:

cd /tmp/
debsnap --binary -d . python3-aiorpcx 0.18.5-1
dpkg -i python3-aiorpcx_0.18.5-1_all.deb