I have yet to find an app on Linux that processes ink as well as windows. Ink is significantly smoother on windows on my thinkpad yoga than on ubuntu on the same hardware. I've tried about half a dozen Linux apps and all collapse round shapes or otherwise have terrible sampling rates compared to the smooth, natural ink on windows. I'll have to watch this one later to see if this looks any better. On my yoga, handwriting is tolerable on ubuntu if you didn't know any better, but it's natural on windows.