How to install `workman` layout in Ubuntu?

I want to install workman layout on Ubuntu, I do not know how to do that?!

Workman layout blog: http://www.workmanlayout.com
Download: http://www.workmanlayout.com/blog/?page_id=964

Click the next link to download it: deekayen-workman-fb07f45.tar.gz. Extract workman.iso15.kmap or workman-p.iso15.kmap file from /deekayen-workman-fb07f45/linux_console/ directory.

Then move it to the /usr/share/X11/xkb/symbols/ directory using terminal:

sudo cp workman.iso15.kmap /usr/share/X11/xkb/symbols/workman

After, run:

setxkbmap -v workman && xset r 66 

You should get something similar to this:

Warning! Multiple definitions of keyboard layout
         Using command line, ignoring X server
Trying to build keymap using the following components:
keycodes:   xfree86+aliases(qwerty)
types:      complete
compat:     complete
symbols:    pc(pc105)+workman+level3(ralt_switch)
geometry:   pc(pc105)

To switch back to QWERTY run:

setxkbmap us; xset -r 66

Obtain the layout from https://github.com/ojbucao/workman and simply follow the instructions in xmodmap/readme.txt :

setxkbmap us; xmodmap xmodmap/xmodmap.workman && xset r 66

To switch back to QWERTY:

setxkbmap us; xset -r 66