Did a update + full-upgrade in terminal which got me through the update error (I'm only one year into Linux)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 26.1.2-1~bpo13+1 best regards Kristoffer Simonsen
- Bug#1125977: mesa-libgallium: The following packages h... Randell Knight
- Bug#1125977: mesa-libgallium: The following packa... Simon McVittie
- Bug#1125977: update + full upgrade Kristoffer Simonsen
