I tried to install Ubuntu 14.10 (or 14.04) 64-bit on an older Acer laptop (but not a totally weak one, I could run Ubuntu 14.04 on it before). It could install or boot from an USB drive (created via unetbootin). When it's installed, it first complains about not having access to init files and then throws a kernel panic that it could not find init. Nothing can be done with it further, recovery kernelpanicks too.
I tried installing it twice, once using a liveCD iso downloaded via torrent, once using a liveCD iso downloaded from the official website, results were the same.
The error message is:
Failed to execute /init (error -8) Starting init: /bin/sh exists but couldn't execute it (error -8) Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/init.exe for guidance
Followed by a call stack and memory map which tells me nothing.