AMD Radeon Driver Purgatory

I am using Ubuntu 21.04 and I wanted to install OpenCL in order to mine. After accidentally installing the AMD pro driver and then uninstalling it, I am now left without any driver, as reported by sudo lshw -c video:

*-display UNCLAIMED
       description: VGA compatible controller
       product: Renoir
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:06:00.0
       version: ce
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix vga_controller bus_master cap_list
       configuration: latency=0
       resources: iomemory:fc0-fbf iomemory:fc0-fbf memory:fce0000000-fcefffffff memory:fcf0000000-fcf01fffff ioport:1000(size=256) memory:d0400000-d047ffff

My question is, there was a driver installed by default, so how do I get that one back? I have tried

sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt update && sudo apt upgrade

as well as

sudo apt-get remove ubuntu-desktop
sudo apt-get install ubuntu-desktop

followed by rebooting, but nothing has worked.

I've also tried to install amdgpu both through the installer provided by AMD and through apt, but keep getting the error:

dpkg: dependency problems prevent configuration of amdgpu:
  amdgpu depends on amdgpu-dkms (= 1:5.9.20.104-1247438); however:
  Package amdgpu-dkms is not configured yet.

But trying to install amdgpu-dkms gives a similar error.

From what I've read, the official AMD drivers aren't supported with my kernel version, but I should be able to revert to the original default driver, right? I also found someone who had success with 21.04 with just installing OpenCL over the default here.

grep -E 'amdgpu|radeon' /etc/modprobe.d/* gives

/etc/modprobe.d/blacklist-amdgpu.conf:blacklist amdgpu
/etc/modprobe.d/blacklist-framebuffer.conf:blacklist radeonfb
/etc/modprobe.d/blacklist-radeon.conf:blacklist radeon

amdgpu module is blacklisted. Remove it by

sudo rm /etc/modprobe.d/blacklist-amdgpu.conf
sudo update-initramfs -u

and reboot.

radeon is also blacklisted, but it doesn't make any difference for your GPU, but you can delete that file too.

AMD Radeon Driver Purgatory

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