prooftree software package provides proof-tree visualization for Proof General, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install prooftree
prooftree is installed in your system.
Make ensure the prooftree package were installed using the commands given below,
$ sudo dpkg-query -l | grep prooftree *
You will get with prooftree package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Science |
| Package | prooftree |
| Version | 0.12-1build1 |
| Description | proof-tree visualization for Proof General |
| Sub Section | Science |