Hello, I think this is part of the Linux kernel. The kernel can be compiled with support for different CPUs (architectures). Looks like you or Ubuntu have used a kernel with combined 32-bit/64-bit support before and now it is stripped to 32-bit-only. On 64-bit hardware you need a 64-bit kernel. There is no hardware emulation for 32-bit. The 32-bit support starts afterwards provided by your Linux system.
Maybe there is another kernel variant you can install with package manager. Why do you install a 32-bit distribution? Hope it helps. Markus
