Flashing screen is known to happen on AMD64 when trying to switch to a VT (see #339379). I tried to install the same iso image on my qemu VM (I have no AMD64 real hw) and the problem did not reproduce; OTOH i got a "unable to install initramfs-tools" but that would be another problem since I got backto the main menu without problem.
Please let us know if you tried to switch to another VT regards, Davide
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