mktemp software package provides coreutils mktemp transitional package, 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 mktemp
mktemp is installed in your system.
Make ensure the mktemp package were installed using the commands given below,
$ sudo dpkg-query -l | grep mktemp *
You will get with mktemp package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Utilities |
| Package | mktemp |
| Version | 8.21-1ubuntu5.1 |
| Description | coreutils mktemp transitional package |
| Sub Section | Utils |