I plan to install a portable Ubuntu. I prefer to install on a flashdrive whith a full functionality. But seems it is not easy, so does not easy to install on an external harddrive. So I would like to put the external harddrive become an internal harddrive and I will install the Ubuntu on it. When all are completed, then I will remove the harddrive from internal and I will put back as an external harddrive. And I expect it will work with full functionality.
Then my question is, is it possible to do so? In this case, the external harddrive will be fully dedicated to Ubuntu, and will not be used for another purpose, such as external storage.