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I want to boot a Ubuntu LiveCD of 16.04 on a desktop box with an AMD A10-5800K 
AGP,  Gigabyte FA-42A75M-HD2 motherboard, 8 GB of RAM, and no graphics card -- 
the Radeon HD 7660D graphics are done by the CPU. When I try to boot I get an 
error message, "ERROR: no UMS support in radeon module." When I edit the boot 
command line to add the parameter 'nomodeset' I first get an error message, "No 
UMS support on radeon module," then the familiar aubergine background with the 
ubuntu logo and the five dots below it changing from white to red and back 
again. After twenty or thirty seconds the background goes to black, I get the 
error message "No UMS support in radeon module," and the ubuntu logo disappears 
but the five dots continue. After another twenty or thirty seconds of that the 
screen clears, at the top is a line: "ubuntu 16.04 ubuntu LTS tty1," below that 
the line "ubuntu login:" and after a second or less the screen goes black and I 
can't do anything except reboot. I've tried old Live 
 CDs, from 10.10 to 15.10, and they all boot fine.
--- 
.tmp.unity.support.test.0:
 
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
DistUpgraded: Fresh install
DistroCodename: wily
DistroRelease: Ubuntu 15.10
DistroVariant: ubuntu
DkmsStatus: virtualbox, 5.0.14, 4.2.0-36-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7660D] [1002:9901] 
(prog-if 00 [VGA controller])
   Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7660D] 
[1002:9901]
InstallationDate: Installed on 2016-06-07 (27 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
Package: xorg 1:7.7+7ubuntu4
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-36-generic 
root=UUID=376cfbdb-7508-4e73-9b25-421ca397ab8a ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-36.42-generic 4.2.8-ckt8
Tags:  wily ubuntu compiz-0.9
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 03/18/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F4
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: F2A75M-HD2
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF4:bd03/18/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnF2A75M-HD2:rvrTobefilledbyO.E.M.:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12.2+15.10.20151202-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Tue Jul  5 00:55:16 2016
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        USB Optical Wheel Mouse MOUSE, id 8
 input        Logitech USB Keyboard KEYBOARD, id 9
 input        Logitech USB Keyboard KEYBOARD, id 10
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.17.2-1ubuntu9.1
xserver.video_driver: radeon

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: apport-collected bot-comment compiz-0.9 kernel-fixed-upstream 
kernel-fixed-upstream-4.4.13 latest-bios-f4 regression-release ubuntu wily 
xenial yakkety
-- 
Ubuntu 16.04 LiveCD does not boot on AMD A10 chip
https://bugs.launchpad.net/bugs/1584284
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