Just got a brand new machine: Toshiba Satellite C855D S5320/AMD dual core e2-1800, upgraded with 16gig kingston ram. Win 8 preinstalled and I hated it. Changed UEFI to legacy and disabled secure boot. Still would not let me partition and install ubuntu so I erased win 8 and started fresh with Ubuntu Secure Remix. It took several days of tinkering but finally installed correctly (machine would freeze at same point of install or not show at boot, tried several live disks until success). I ran boot repair.
Current problem-laptop freezes as various stages (sometimes right after boot, sometimes 45 min. after running smoothly).
Boot repair tag: http://paste.ubuntu.com/5586393/
Any help would be greatly appreciated.