I would like to expand my Elementary OS root partition, as 12GB isn't enough anymore.
I'm using Elementary OS dual boot with Windows 10, so I shrank my C drive (where Windows is installed) by 15GB in order to add them to my Elementary's root partition.
I got a backup of my important files and booted from a live usb.
I can't figure out how to add those 15GB of unallocated space to my root partition (sda5) as the resize option on the root partition is disabled.
Could you please let me know which are the exact steps I should follow so as not to destroy my system by accident? Thank you in advance!