Ubuntu partitions are incompatible with Windows, we can not read and write to them from widows. Ext4 partitions can be read from windows if you install a simple utility in Windows.
Download ext2fsd from
Here is a quick way to build an exactly similar ubuntu installation on another computer.
Run $ dpkg --get-selections >my_pakages
on the machine that you want to clone. Install a clean copy of Ubuntu on the target machine. Copy the file my_packages to the target machine. Run the following command on the target machine. $ sudo dpkg --set-selections < ./package_names $ sudo apt-get -u dselect-upgrade