It's a Ubuntu 11.04 AMD64 desktop install.
Ubuntu Classic works.
The day before this happened, I used the same CD to install successfully Ubuntu 11.04 and Unity on my old machine bought in 2006 (AMD Turion 64 Mobile Technology ML-34 processor), so imagine my surprise when Unity wouldn't run on my partner's new machine bought in 2010, hence this thread.
OpenGL vendor string: Mesa Project
OpenGL renderer string: Software Rasterizer
OpenGL version string: 2.1 Mesa 7.10.2
Not software rendered: no
Not blacklisted: yes
GLX fbconfig: yes
GLX texture from pixmap: no
GL npot or rect textures: yes
GL vertex program: yes
GL fragment program: yes
GL vertex buffer object: yes
GL framebuffer object: yes
GL version is 1.4+: yes
Unity supported: no
Does anyone have any suggestions of what I can try?