Yes, you need to run fdisk to actually change the partition table. After you resize your file system with resize2fs (the partition must be unmounted), look at ...
When resizing an ext4 file system, the resize2fs utility reads the size in units of file system block size, unless a suffix indicating a specific unit is used.
Right-click on the ext4 partition you want to resize and select “Resize/Move.” In the Resize/Move dialog, you can adjust the size of the filesystem by dragging ...
Growing the partition with your root file system should work just fine as long as: 1. You don't change the starting sector number. 2. You reboot after changing ...
Yes, you can use resize2fs to do it, but it has to be done while the filesystem is unmounted. The partition itself can be resized while the system is online.