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Ubuntu 13.04 install amd64 kernel from x86 OS

Asked by Andrey Bondarenko

I have Ubuntu 13.04 32-bit OS installed on Intel Core 2 system and want to start 64-bit virtual machine from it.

I suppose CPU can run 64-bit code, but I need 64-bit kernel for this. I've added foreign architecture:

$ sudo dpkg --add-architecture amd64

Now I'm trying to install linux-image and linux-headers from amd64. Binary package linux-image can'be installed and runs ok, but I cannot install linux-headers package because of dependency issues.

$ sudo env LANG=C apt-get --dry-run install linux-headers-3.8.0-32-generic:amd64

The following packages have unmet dependencies:
 linux-headers-3.8.0-32-generic:amd64 : Depends: linux-headers-3.8.0-32:amd64 but it is not installable
E: Unable to correct problems, you have held broken packages

Looks like some linux-headers related packages are marked as architecture dependent, while others not:

$ env LANG=C aptitude search headers-3.8.0-32
p linux-headers-3.8.0-32 - Header files related to Linux kernel version 3.8.0
p linux-headers-3.8.0-32-generic - Linux kernel headers for version 3.8.0 on 32 bit x86 SMP
p linux-headers-3.8.0-32-generic:amd64 - Linux kernel headers for version 3.8.0 on 64 bit x86 SMP
p linux-headers-3.8.0-32-lowlatency - Linux kernel headers for version 3.8.0 on x86/x86_64
p linux-headers-3.8.0-32-lowlatency:amd64 - Linux kernel headers for version 3.8.0 on x86/x86_64
p linux-lowlatency-headers-3.8.0-32 - Header files related to Linux kernel version 3.8.0

Is there a possibility to override dependencies and install headers needed for building kernel modules or it requires fixing kernel sources? Why headers are marked architecture dependent? Are they different in different arches?

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Manfred Hampl (m-hampl) said : 		#1

I am not sure if there is a reasonable possibility to do an architecture change from 32 bit to 64 bit without complete reinstallation.

linux-headers-3.8.0-32 is architecture-independent (linux-headers-3.8.0-32_3.8.0-32.47_all.deb), so it should be installable on any architecture. Can you try installing that package manually? And when that one is installed, does apt-get install linux-headers-3.8.0-32-generic:amd64 still complain? Maybe using dpkg instead of apt-get does not show that architecture dependency problem?

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