Hello, and sorry for the late reply here.
One possible workaround for such a problem would be to run upgrade your
deb and/or snap package of snapd before attempting a system upgrade:
sudo apt update
sudo apt install --only-upgrade snapd
sudo snap refresh snapd
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https://bugs.launchpad.net/bugs/1997154
Title:
package firefox 87.0+build3-0ubuntu0.20.10.1 failed to
install/upgrade: new firefox package pre-installation script
subprocess returned error exit status 1
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