Update: System finally did boot - accidentally. I use this box rarely to boot Ubuntu, most of the time I boot into an old fedora-3. Just for info, and if it helps anybody, including the developers, I think the problem is related to system motherboard in power up state. If I completely cut power to the computer (pull the plug and remove Ethernet cable - I realize, cmos battery is still there, so strictly speaking this is not completely dead) then my computer did boot into 16.04. It looks like using reboot option from fedora-3, or even using a dual boot feature prevents 16.04 to complete the boot process and enter into the loop described above. I don't know if this is normal behavior, but I thought I'd bring this into the attention of anybody who reads this - and maybe help somebody with the same problem. As far as I'm concerned I would close this bug but don't know how. Janos
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