I didn't know that Ubuntu was using AMDGPU by default and I've installed fglrx. It's already removed now.
I want to reactivate AMDGPU, how can I do that?
lspci -nn | grep VGA

lsmod | grep amd

I didn't know that Ubuntu was using AMDGPU by default and I've installed fglrx. It's already removed now.
I want to reactivate AMDGPU, how can I do that?
lspci -nn | grep VGA

lsmod | grep amd

If your graphics card is supported you may wish to consider AMDGPU-PRO. You can find the latest 16.60 version of the driver here [link] (http://support.amd.com/en-us/kb-articles/Pages/AMDGPU-PRO-Driver-for-Linux-Release-Notes.aspx)
The opensource amdgpu driver is for GCN+ class hardware only. Your GPU is a VLIW-based HD 5000 series that works with the radeon driver out of the box, and is NOT supported by the amdgpu driver.