Problem with settings window in VirtualBox 5.0.x on x86 Linux host about phpvirtualbox

[cREoz]

i found this on google - Issue 347: Edit the settings in one virtualmachine get error "Page fusion is only supported on 64-bit"

[JadinAndrews]

It must be vboxmanage complaining, for some reason phpvirtualbox is trying to enable pagefusion, possibly to reduce the memory footprint when deploying multiple VMs. Please refer to the manual for more detail on page fusion. It's in section 4.9.2 (Right at the bottom) of this:
https://www.virtualbox.org/manual/ch04.html

[cREoz]

manual say:

Note
VirtualBox supports Page Fusion only on 64-bit hosts

and on 32-bit host system i get error when try to change it to ON or OFF.

user@vboxhost:~$ uname -a
Linux vboxhost 3.13.0-73-generic #116-Ubuntu SMP Fri Dec 4 15:33:02 UTC 2015 i686 i686 i686 GNU/Linux

user@vhost:~$ VBoxManage modifyvm "vbox" --pagefusion on
VBoxManage: error: Page fusion is only supported on 64-bit hosts
VBoxManage: error: Details: code NS_ERROR_NOT_IMPLEMENTED (0x80004001), component SessionMachine, interface IMachine, callee nsISupports
VBoxManage: error: Context: "COMSETTER(PageFusionEnabled)(ValueUnion.f)" at line 591 of file VBoxManageModifyVM.cpp

user@vboxhost:~$ VBoxManage modifyvm "vbox" --pagefusion off
VBoxManage: error: Page fusion is only supported on 64-bit hosts
VBoxManage: error: Details: code NS_ERROR_NOT_IMPLEMENTED (0x80004001), component SessionMachine, interface IMachine, callee nsISupports
VBoxManage: error: Context: "COMSETTER(PageFusionEnabled)(ValueUnion.f)" at line 591 of file VBoxManageModifyVM.cpp

comment from phpvirtualbox - issue #347:

The only work around is disable the advanced config.

because with advanced config phpvirtualbox always apply pagefusion option.