A long time ago I was using dual-boot and I reserved a 100gb partition for Ubuntu 20.04 LTS on a 1 tb hard disk. Now I have deleted windows via the OS-uninstaller tool and I want to merge the remaining partition to the partition with Ubuntu. There are a few files in the remaining section. Is there a way to merge the partition without formatting it?
# fdisk -l
Device Start End Sectors Size Type
/dev/sda1 2048 1085439 1083392 529M Windows recovery environment
/dev/sda2 1085440 1290239 204800 100M EFI System
/dev/sda3 1290240 1757923327 1756633088 837,6G Linux filesystem
/dev/sda6 1757923328 1953523711 195600384 93,3G Linux filesystem
Also can I format the partition where the Windows recovery environment is located?
NOTE: I cannot resize using GPARTED tool. I think, the reason is /dev/sda3 not free space. I'm not sure...
