Same Problem here. I moved Kubuntu 12.04 from old PC to this new PC, runs without problem but needed to upgrade to 12.10 because of a softwareproblem. 12.10 also runs without problems.
Because upgrade to 13.10 did not work I installed 14.04 new from USB, install reboots every few seconds, no matter if I press any button, try to install or just wait, a few seconds after boot it reboots.
Adding radeon.dpm=0 to boot options solved installer. After install kubuntu reboots again after a few seconds. Adding radeon.dpm=0 to grub-boot-line starts ok. Now added radeon.dpm=0 to grub-conf
Hardware:
MSI A78M-E35 (MS-7721) and AMD A4-4020 APU with Radeon(tm) HD Graphics
Also addes dmesg.1.gz from first boot without radeon.dpm=0
Hope this helps somehow, have PC only till tomorrow, it's from my neighbour
Same Problem here. I moved Kubuntu 12.04 from old PC to this new PC, runs without problem but needed to upgrade to 12.10 because of a softwareproblem. 12.10 also runs without problems.
Because upgrade to 13.10 did not work I installed 14.04 new from USB, install reboots every few seconds, no matter if I press any button, try to install or just wait, a few seconds after boot it reboots.
Adding radeon.dpm=0 to boot options solved installer. After install kubuntu reboots again after a few seconds. Adding radeon.dpm=0 to grub-boot-line starts ok. Now added radeon.dpm=0 to grub-conf
Hardware:
MSI A78M-E35 (MS-7721) and AMD A4-4020 APU with Radeon(tm) HD Graphics
Also addes dmesg.1.gz from first boot without radeon.dpm=0
Hope this helps somehow, have PC only till tomorrow, it's from my neighbour