I have a computer that had a 32 bit os on it when I got it, I thought it was 32 bit. So installed debian-7 32 bit. I latter upgraded the kernel to pae, and then to 64bit. It is now a 64bit kernel, and 32bit user-land.
I am trying to upgrade to debian-8 64bit, by doing a fresh install. However when I tell computer firmware/bios to boot from the CD, it is not recognising operating-system on CD. It says no operating system found. Is it possible that the bios is programmed to not allow a 64bit boot? If so how can I install the OS?
Acer aspire 5228
lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 23 Stepping: 10 CPU MHz: 1795.640 BogoMIPS: 3590.97 L1d cache: 32K L1i cache: 32K L2 cache: 1024K NUMA node0 CPU(s): 0,1 cat /proc/cpuinfo processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Celeron(R) Dual-Core CPU T3000 @ 1.80GHz stepping : 10 microcode : 0xa0b cpu MHz : 1795.640 cache size : 1024 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dtherm bogomips : 3590.97 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
Operating system info:
uname -a Linux richard-laptop 3.2.0-4-amd64 #1 SMP Debian 3.2.81-1 x86_64 GNU/Linux cat /etc/debian_version 7.11 aptitude show grub-pc Package: grub-pc State: installed Automatically installed: no Multi-Arch: foreign Version: 1.99-27+deb7u3 Priority: optional Section: admin Maintainer: GRUB Maintainers <email@example.com> Architecture: i386 Uncompressed Size: 488 k Depends: debconf (>= 0.5) | debconf-2.0, grub-common, grub2-common (= 1.99-27+deb7u3), grub-pc-bin (= 1.99-27+deb7u3), ucf Conflicts: grub (< 0.97-54), grub-coreboot, grub-efi-amd64, grub-efi-ia32, grub-ieee1275, grub-legacy Replaces: grub, grub-common (<= 1.97~beta2-1), grub-coreboot, grub-efi-amd64, grub-efi-ia32, grub-ieee1275, grub-legacy, grub2 (< 1.99-27+deb7u3) Description: GRand Unified Bootloader, version 2 (PC/BIOS version) GRUB is a portable, powerful bootloader. This version of GRUB is based on a cleaner design than its predecessors, and provides the following new features: * Scripting in grub.cfg using BASH-like syntax. * Support for modern partition maps such as GPT. * Modular generation of grub.cfg via update-grub. Packages providing GRUB add-ons can plug in their own script rules and trigger updates by invoking update-grub2. * VESA-based graphical mode with background image support and complete 24-bit color set. * Support for extended charsets. Users can write UTF-8 text to their menu entries. This package contains a version of GRUB that has been built for use with traditional PC/BIOS architecture. Homepage: http://www.gnu.org/software/grub/
CD info: it was obtained on the cover of a magazine and was used to install my other laptop. (I added some newlines to the below, to make this output more readable):
file -Lsk /dev/cdrom /dev/cdrom: sticky # ISO 9660 CD-ROM filesystem data 'LXFDVD199 ' (bootable)\012- x86 boot sector; GRand Unified Bootloader, stage1 version 0x79, boot drive 0xbb, stage2 address 0x8e70, 1st sector stage2 0xb8db31c3, stage2 segment 0x201; partition 1: ID=0xee, starthead 0, startsector 1, 9003999 sectors, extended partition table (last)\011, code offset 0x52