dtach software package provides emulates the detach/attach feature of screen, 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 dtach
dtach is installed in your system.
Make ensure the dtach package were installed using the commands given below,
$ sudo dpkg-query -l | grep dtach *
You will get with dtach package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Miscellaneous |
| Package | dtach |
| Version | 0.8-2ubuntu0.12.04.1 [amd64, i |
| Description | emulates the detach/attach feature of screen |
| Sub Section | misc |