Debian is just Ubuntu before they add Snap.

Or, remove snap from Ubuntu:

# Remove snap
        if [ -n "$(which snap 2>/dev/null)" ]; then
                SNAPS=$(snap list |awk '{print $1}' |grep -v Name)
                for SNAP in ${SNAPS} do; snap remove ${SNAP}; done
                sudo systemctl stop snapd
                sudo systemctl stop snapd.socket
                sudo systemctl disable snapd
                sudo systemctl mask snapd
                sudo apt purge snapd -y
                sudo apt-mark hold snapd
                sudo cat <<EOF | sudo tee /etc/apt/preferences.d/nosnap.pref
Package: snapd
Pin: release a=*
Pin-Priority: -10
EOF
                rm -rf ~/snap
                sudo rm -rf /snap
                sudo rm -rf /var/snap
                sudo rm -rf /var/lib/snapd
                # Add needed repositories
                sudo add-apt-repository ppa:mozillateam/ppa -y
                echo '
Package: *
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 1001

Package: thunderbird
Pin: version 2:1snap*
Pin-Priority: -1
' | sudo tee /etc/apt/preferences.d/thunderbird
                sudo add-apt-repository ppa:xtradeb/apps -y
        fi