Mainly i found that memory is dedicated to kdump and kexec.
GRUB config file: etc/grub.d/10_linux:
#add crashkernel option if we have the required tools
if [ -x "/usr/bin/makedumpfile" ] && [ -x "/sbin/kexec" ]; then
GRUB_CMDLINE_EXTRA="$GRUB_CMDLINE_EXTRA crashkernel=384M-2G:64M,2G-:128M"
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ubuntu states less virtual memory then is physically installed.
https://bugs.launchpad.net/bugs/595200
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