It ok to make new partitions when system is already installed? Just open GParted and start to make new partitions, Or is it recommended during OS installation process?
You cannot move/resize/delete a mounted partition in Gparted.If you boot ubuntu,at the time of booting your ubuntu partition will automatically mounted.so after booting into ubuntu,gparted can't able to resize/delete your ubuntu partition.
If you want to make partitioning on Ubuntu partition,the only option is Gparted-live-disk.Because gparted on a live disk booted up(live disk partition only mounted,it was like /dev/sdb or /dev/sdc)but the hard-disk partitions was not mounted(it was like /dev/sda).
