I heard that Ubuntu is not completely free (as in Freedom). What are the specific parts of Ubuntu that are not Free?
What makes Ubuntu not totally Free Software?
ubuntu;opensource projects;free software
Assuming you mean Free as in Freedom rather than free as in beer (see this essay for one description of the difference between the two), a person claiming that Ubuntu is not free may be referring to one of the following issues:Binary blobs in the Linux kernel (this is often firmware that is needed to let a free driver work).Non-free hardware drivers.Non-free software that is in the Ubuntu repositories, such as flash.Sometimes, they may be referring to the inclusion of software that poses legal problems in the US because of patents or other issues; however, such issues are usually orthogonal to the software being free.However, it is more than possible to have a completely free system using Ubuntu.  The vrms package in the Ubuntu repository is a good first step if you are concerned with non-free packages that are installed on your system.  If you want to go even further, you can consider using Linux Libre a version of the Linux kernel that has non-free binary blobs removed from it.  Note, however, that installing linux libre will break your support for any hardware that needs those non-free bits.  I personally find it free enough to ensure that I don't have any non-free packages installed and tend not to worry about binary blobs.  But each person tends to draw the freedom line in a different place.