Get Inkscape for GNU/Linux
Latest stable version (0.92.1)
Inkscape is pre-packaged for most of the widely used free GNU/Linux distributions.
So your package manager / app store should be able to find Inkscape in one line.
Keep in mind that the version offered in your distro's repositories is not necessarily the latest version.
Inkscape Snap Package
A distribution-independent snap package for Inkscape 0.92.1 is now available. On Ubuntu 16.04 or higher, just visit the software center and install the latest version that is available there. If you're using a different system, install snapd if it's not yet installed, then, as root user, type
snap install inkscape
in the terminal. If you have an old version of Inkscape already installed via package management, that version may still have priority in your path. To solve this problem, you can either uninstall the old version, change the priority of /snap/bin/ and /var/lib/snapd/desktop/applications/ in your path, or run the snap of Inkscape with the command
Mathias Vogelgesang has created a Flatpak recipe for Inkscape 0.92.1 and has made the resulting Inkscape Flatpak for x86_64 available for download on our website. The Flatpak is assumed to work on Fedora 25, OpenSUSE Tumbleweed, Debian Testing, Arch, and Mageia Cauldron as well as, after a slightly more involved installation procedure, on Ubuntu 16.04+.
For issues that are related to the Flatpak packaging, you can contact the author via the repository at github.
Inkscape for Specific Distributions
Ubuntu: Stable PPA or via package management.
OpenSUSE: Package Search
Arch Linux: See ArchWiki