I haven't been able to get 3d acceleration to work properly on my VBox guest, no matter what I do I always get fallback unity 2d mode, here's what I've tried:
- Enabled "3d acceleration" on VBox settings, set video memory all the way to 128mb.
- Installed vbox guest additions, checked to see if there was any guest additions pre-installed first, it didn't throw any errors
- Enabled "Oracle VirtualBox Guest Additions for Linux Module" in "Additional Drivers"
- Ran "unity --replace"
Nothing seems to work, I'm using VBox 4.1.10. The guest additions seem to work partially though, before I install them if I maximize my ubuntu guest window it doesn't resize up but after installing them the desktop does resize correctly but I'm stuck in unity 2d (I also tried installing gnome-shell and it also threw me in fallback mode)
Anyone knows what could be wrong? Thanks in advance!
EDIT: Looks like it's not a problem with Unity but VirtualBox, I tried with mint, arch and debian and all DEs switched me to fallback mode