I moved and resized by /boot primary partition using gparted.
sudo parted /dev/sda print
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2
2 257MB 128GB 128GB extended
5 257MB 128GB 128GB logical lvm
3 253GB 256GB 3146MB primary ext2 boot
Yet, the size of the filesystem remains the same:
df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 240972 235317 0 100% /boot
...
I've tried to extend the filesystem:
sudo resize2fs /dev/sda1
But it returns:
The filesystem is already 248832 (1k) blocks long. Nothing to do!