Problem : To open a .chm file in linux ( ubuntu).
To open a .chm file in linux, you can use the package xchm.
To install xchm run the command
sudo apt-get install xchm
or open the synaptic package manager, and search for xchm.
Then right click mark for installation-> apply->apply.
Once this is done, you will be able to see the xchm in
Cick on the xCHM, it will open the xCHM apllication.
Click on "open" on the top and then browse to the location where you have kept your .chm file, select it and click on open.
You .chm file should open now.