I founded a workarounded : just unmount the unneded partitions in the following loop : while true; do sudo umount /dev/sda7; sudo umount /dev/sda5 ; done
This allows to finish the install with success.
I founded a workarounded : just unmount the unneded partitions in the following loop :
while true; do sudo umount /dev/sda7; sudo umount /dev/sda5 ; done
This allows to finish the install with success.