bios_grub partition in the way of resizing Ubuntu partition

  • Simply delete /dev/sda6.

  • Then right-click on the dev/sda7 ext4 partition to add the unallocated space 97.71 GB+1 MB to the ext4 partition.

  • Finally ran boot-repair.

Note: Please make sure that the partitions which you are going to resize should be unmounted.