Hello,
As instructed, I disconnected the other drives, leaving the main harddrive and 
the DVD-RW drive.
This did not had any effect: grub 2.02 showed the same error: error: disk 
'hd0,msdos5' not found.
booting from a CD and restoring grub 2.00 (sudo dkpg -i grub* in the directory 
where I keep a copy of the grub debs) put the system back in bootable state.
I have attached the device.map file found in /boot/grub. The identification of 
hd0 is correct.
Also in grub.cfg, one can read:
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 
--hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5 --hint='hd0,msdos5'  
94ecf542-619c-4fe7-bfed-672fa7bb2739
else
  search --no-floppy --fs-uuid --set=root 94ecf542-619c-4fe7-bfed-672fa7bb2739
fi
The uuid is indeed the one of hd0,msdos5.

msdos5 (or sda5) is the first partition within the extended partition sda3. 
sda1 & sda2 are primary partitions for Windows.
sda6 is the swap, and sda7 is mounted as /home. Could this be troubling Grub?

The configuration of the hardware hasn't changed since I assembled it,
and installed the Windows and Xubuntu.

I am still ready to help and test whatever solution you may come up with.
Best regards,

** Attachment added: "device.map file in use"
   
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1316068/+attachment/4394397/+files/device.map

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Title:
  error: disk 'hd0,msdos5' not found

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