This might be because btrfs-progs is not seeded for lubuntu on the
install image I get this in the installer.
btrfs-progs:
Installed: (none)
Candidate: 4.5.2-1
Version table:
4.5.2-1 500
500 http://archive.ubuntu.com/ubuntu yakkety/main amd64 Packages
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https://bugs.launchpad.net/bugs/1591851
Title:
creation of btrfs partition fails during install
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