jalview software package provides multiple alignment editor, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install jalview
jalview is installed in your system.
Make ensure the jalview package were installed using the commands given below,
$ sudo dpkg-query -l | grep jalview *
You will get with jalview package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Science |
| Package | jalview |
| Version | 2.7.dfsg-2 |
| Description | multiple alignment editor |
| Sub Section | Science |