I don't know which GPU you have, but the OSS driver should support OpenGL 4.5, at least with the updates ppa enabled (ppa:ubuntu-x-swat/updates) which has Mesa 17.1.2 for xenial and zesty.
I don't know which GPU you have, but the OSS driver should support OpenGL 4.5, at least with the updates ppa enabled (ppa:ubuntu- x-swat/ updates) which has Mesa 17.1.2 for xenial and zesty.