Another Workaround from my side:
sudo -i
vi /etc/apt/sources.list.d/apt-btrfs-snapshot.list
#apt-btrfs-snapshot
deb http://de.archive.ubuntu.com/ubuntu bionic main universe
vi /etc/apt/preferences.d/proposed-updates
Package: *
Pin: release a=bionic
Pin-Priority: 400
apt update
apt install apt-btrfs-snapshot/bionic
apt-btrfs-snapshot supported
exit
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https://bugs.launchpad.net/bugs/1454306
Title:
apt-btrfs-snapshot supported reports "Sorry, your system lacks support
for the snapshot feature" since update of btrfs-tools to 4.0-2 in
debian/testing
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