I would like to Install Ubuntu 17.10 on my computer (the latest release). I have an ISO image of Ubuntu 16.10 (non LTS). So can I upgrade from Ubuntu 16.10 to 17.10?. Also, considering the fact that the fresh install of Ubuntu 16.10 would mean to install all it's system updates and then further upgrading to 17.10, which is a better option, upgrading or fresh install of 17.10? Also, will upgrading would cost me my data equal to that of the size of the ISO image of Ubuntu 17.10 (i.e, 1.4GB)?
For evaluating new releases, my approach is to partition the boot drive into 3 parts: 1 for ubuntu 16, 1 for ubuntu 17, and 1 for the /home. Easiest way is to use the install routine and choose "other" and related options. Upon restart, choose the version on the boot screen.
 Since posting this a month prior, Ubuntu 17.10 now enables the "sudo", which permits root and synaptic. hooray!!! But gnome cannot scale the 4k monitor to 250%, which is not optimum for me, and gnome has other limitations that are suboptimal, not to mention the bugs reported by others. However, since switching from 17.04 unity to 17.10 gnome, I see a definite improvement in overall speed of my desktop. Evince is no longer buggy and slow: it is smooth and quick. Similar for LibreOffice. So gnome is now preferred to unity.