1. CHM转为HTML

Install Chmlib in Ubuntu

sudo apt-get install libchm-bin

Convert .chm files in to HTML files

extract_chmLib book.chm outdir

2. CHM转为PDF

First you need to install htmldoc. HTML processor that generates indexed HTML, PS, and PDF.HTMLDOC is a program for writing documentation in HTML and producing indexed HTML, PostScript, or PDF output (with tables of contents). It supports most HTML 3.2 and some HTML 4.0 syntax, as well as GIF, JPEG, and PNG images.

sudo apt-get install htmldoc

If you want to use htmldoc type the following command in terminal

htmldoc

Once it opens you should see similar to the following screen here you can choose the html file and convert them to pdf,ps

（来源：http://www.ubuntugeek.com/how-to-convert-chm-files-to-html-or-pdf-files.html ）

或者：

1.安装libchm-bin，  htmldoc

sudo apt-get install libchm-bin htmldoc

2.提取出html文件

extract_chmLib <path to the chm file> <directory for the resulting HTML files>

3.把转换成pdf

htmldoc -t pdf13 --webpage -f myFile.pdf *.html

就此搞定 如果希望把chm转给kindle看，第三步可以使用以下命令：

htmldoc -t pdf13 --color --webpage --compression --fontsize 18.0 --browserwidth 824 --right 5mm --left 5mm -f ../myBook.pdf *.html