Try Ubuntu 17.10 from USB installation disk crashes

[David L]

On one of my computers (motherboard=M5A99FX PRO R2.0), Ubuntu 17.10 crashes
when attempting to "try ubuntu without installing".  It prints a call trace:

ahci_deinit_port.constprop.21+0x19/0x90 [libahci]
ahci_init_controller+0xde/0x140 [libahci]
ahci_pci_init_controller+0x42/0x50 [ahci]
local_pci_probe+0x42/0xa0
work_for_cpu_fn+0x14/0x20
process_one_work+0x1e7/0x410
worker_thread+0x226/0x410
kthread+0x125/0x140
? process_one_work+0x410/0x410
? kthread_create_on_node+0x70/0x70
ret_from_fork+0x25/0x30
Code: fc 48 8b 50 20 8b 47 2c c1 e0 07 4c 8b 6a 10 89 c3 8b 02 a9 01 80 00
00 75 09 31 c0 5b 41 5c 41 5d 5d c3 83 e0 fe
RIP: ahci_stop_engine+0x42/0xc0 [libahci] RSP: ffffbbdd98101fc90
CR2: ffffbbd980c9a018
---[ end trace 817b91bee1e5ece2 ]----

Not sure I typed all that in correctly... here's a picture:

https://drive.google.com/file/d/0B5MNiGB_nlGJUGVwSnlaekFGZ0k/view?usp=sharing

I put the hard drive into another computer and installed 17.10 there and
then reinstalled it in the one that wouldn't boot to USB and it hangs
during boot.  I haven't been able to verify that the problem is the same...
I'm not seeing the call trace.
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