Also had this problem with an AMD A8-5600 and MSI A78M-E35 Motherboard. The
.iso would reboot before getting to the desktop screen. Finally found a
solution.
When booting the .iso image and the keyboard icon appeared at bottom of
screen, I pressed any key to enter the options menu. Selected F6 - other
options and then selected acpi=off. The .iso then booted without rebooting
itself before it got to the desktop, and installed OK. After 14.04 amd64 was
installed, the fact that acpi was set to acpi=off in the grub.cfg file was
keeping my computer from shutting down properly, so I set it back to acpi=on in
the grub.cfg file. Then my shutdown worked properly.
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https://bugs.launchpad.net/bugs/1309578
Title:
Ubuntu 14.04 suddenly reboots when booting from Live USB AMD A8 6600k
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