The chmsee project has been dead for several years. Here’s some alternatives to chmsee for you to read chm files on Ubuntu.
To install xCHM on Ubuntu 14.04/15.10/16.04, open a terminal window and issue this simple command:
sudo apt-get install xchm
kchmviewer makes it possible to browse native Windows CHM files under KDE. You can add bookmarks, change font size, search for texts in kchmviewer. It’s a KDE application, but can also be used on Gnome and Unity desktop.
To install kchmviewer on Ubuntu 14.04/15.10/16.04, open a terminal window and issue this simple command:
sudo apt-get install kchmviewer
Since it’s a KDE application, this above command will also install some KDE dependencies.