** Description changed:

+ How to quickly reproduce :
+ - From a Linux distro installed (Ubuntu 18.04 here) 
+ - Install grml  : sudo apt install grml-rescueboot
+ - Get Focal iso : wget -0 /boot/grml/focal.iso 
+ - add toram option  :  echo ' CUSTOM_BOOTOPTIONS="toram" ' | sudo tee -a 
+ - Generate the Grub entry : sudo update-grub
+ - Reboot and select the Grub entry for the iso 
+ - Start the Ubuntu installation : Ubiquity ask if it should try to umount 
/isodevice - You accept - But patitioning fails anyway .
+ See https://help.ubuntu.com/community/Grub2/ISOBoot for more info 
+ --- Initial report ---- 
  When installing from an iso file, with grub's loopback option, Ubiquity
  displays a message stating the isodevice cannot be unmounted, even when
  the isofile is not located on the same harddrive as the installation
  sudo umount -l -r -f /isodevice
  solves this problem, so Ubiquity should be able to issue this command by
  itself, without any user action.

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  Unable to umount /isodevice when using grub loopback method

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