For those with dual graphics: Although it is not supposed to be required any longer, I answer this question often enough on the Ubuntu Forums that I recommend the following:
If you have fglrx installed and end up with a blank/black screen, go into recovery mode, mount your filesystem read/write. Issue the following command:
amdconfig --adapter=all --initial
and reboot.
If you have uninstalled it, reinstall it. Before rebooting, issue the amdconfig command.
For those with dual graphics: Although it is not supposed to be required any longer, I answer this question often enough on the Ubuntu Forums that I recommend the following:
If you have fglrx installed and end up with a blank/black screen, go into recovery mode, mount your filesystem read/write. Issue the following command:
amdconfig --adapter=all --initial
and reboot.
If you have uninstalled it, reinstall it. Before rebooting, issue the amdconfig command.