While it is installable from https://apps.ubuntu.com/cat/applications/treesheets/ (even though 15.10 doesn't show up on "available version", it still installs), searching for "treesheets" directly in the Ubuntu Software Center fails, and neither can it be found from search in Ubuntu after being installed.
While it is installable from https:/ /apps.ubuntu. com/cat/ applications/ treesheets/ (even though 15.10 doesn't show up on "available version", it still installs), searching for "treesheets" directly in the Ubuntu Software Center fails, and neither can it be found from search in Ubuntu after being installed.