The official personal package archive on launchpad contains daily builds of the stable Inkscape development branch (0.92.x) for Ubuntu (and Ubuntu derivatives, e.g. Linux Mint, elementary OS).
To add the ppa to your list of software sources, open a terminal and type:
$ sudo add-apt-repository ppa:inkscape.dev/stable-daily
Agree to the questions it asks. It is recommended to
Then refresh the list of available packages with:
$ sudo apt-get update
Then get the latest Inkscape development version with:
$ sudo apt-get install inkscape
This will replace your stable Inkscape version from the Ubuntu repositories.
To go back to the version that is officially available in Ubuntu, remove the ppa from your package sources or disable it, uninstall Inkscape, update the package cache, then install the stable version.