The problem is that aptdaemon invokes dpkg three times, as mentioned in the dpkg manual http://manpages.ubuntu.com/manpages/trusty/man1/dpkg.1.html "Note: front-ends might call dpkg several times per invocation, which might run the hooks more times than expected."
My very ugly workaround is to check if any snapshot has been made within the last 60 seconds. I'm attaching my modified /etc/apt/apt.conf.d/80 -btrfs-snapshot ** Attachment added: "80-btrfs-snapshot" https://bugs.launchpad.net/ubuntu/+source/apt-btrfs-snapshot/+bug/852458/+attachment/4191441/+files/80-btrfs-snapshot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/852458 Title: three snapshots created To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt-btrfs-snapshot/+bug/852458/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
