Aah.. so it is detected correctly by the LiveCDs.
In that case it is a simple case of the Desktop version of kernel
(-generic) not being configured to handle more than 4Gb memory. You have
two options:
1. Use the precompiled -server kernel that is configured to use upto
64Gb of memory
OR
2. Compile your own -generic kernel with CONFIG_HIGHMEM64G set
** Changed in: ubuntu
Status: New => Won't Fix
--
8.04 i386 -generic kernel seeing 3GB RAM on 64-bit 8GB RAM system
https://bugs.launchpad.net/bugs/217309
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