It appears the graphics driver isn't working because you have told the kernel to disable support for KMS ("nomodeset"):
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic root=UUID=ae28586a-e989-4c32-9ab5-ceee8bacba22 ro recovery nomodeset To fix this please edit /etc/default/grub and remove "nomodeset". Then run: sudo update-initramfs and reboot. ** Tags added: radeon ** Summary changed: - screen + [radeon] screen problems ** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1781384 Title: [radeon] screen problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1781384/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp